Topology of Algebraic Curves : : An Approach via Dessins d'Enfants / / Alex Degtyarev.

This monograph summarizes and extends a number of results on the topology of trigonal curves in geometrically ruled surfaces. An emphasis is given to various applications of the theory to a few related areas, most notably singular plane curves of small degree, elliptic surfaces, and Lefschetz fibrat...

Full description

Saved in:
Bibliographic Details
Superior document:Title is part of eBook package: De Gruyter DG Studies in Mathematics eBook-Package
VerfasserIn:
Place / Publishing House:Berlin ;, Boston : : De Gruyter, , [2012]
©2012
Year of Publication:2012
Language:English
Series:De Gruyter Studies in Mathematics , 44
Online Access:
Physical Description:1 online resource (393 p.)
Tags: Add Tag
No Tags, Be the first to tag this record!
id 9783110258424
lccn 2012006099
ctrlnum (DE-B1597)124045
(OCoLC)900724366
collection bib_alma
record_format marc
spelling Degtyarev, Alex, author. aut http://id.loc.gov/vocabulary/relators/aut
Topology of Algebraic Curves : An Approach via Dessins d'Enfants / Alex Degtyarev.
Berlin ; Boston : De Gruyter, [2012]
©2012
1 online resource (393 p.)
text txt rdacontent
computer c rdamedia
online resource cr rdacarrier
text file PDF rda
De Gruyter Studies in Mathematics , 0179-0986 ; 44
Frontmatter -- Preface -- Contents -- Part I. Skeletons and dessins -- Chapter 1. Graphs -- Chapter 2. The groups Γ and B3 -- Chapter 3. Trigonal curves and elliptic surfaces -- Chapter 4. Dessins -- Chapter 5. The braid monodromy -- Part II. Applications -- Chapter 6. The metabelian invariants -- Chapter 7. A few simple computations -- Chapter 8. Fundamental groups of plane sextics -- Chapter 9. The transcendental lattice -- Chapter 10. Monodromy factorizations -- Appendices -- Appendix A. An algebraic complement -- Appendix B. Bigonal curves in Σd -- Appendix C. Computer implementations -- Appendix D. Definitions and notation -- Bibliography -- Index of figures -- Index of tables -- Index
restricted access http://purl.org/coar/access_right/c_16ec online access with authorization star
This monograph summarizes and extends a number of results on the topology of trigonal curves in geometrically ruled surfaces. An emphasis is given to various applications of the theory to a few related areas, most notably singular plane curves of small degree, elliptic surfaces, and Lefschetz fibrations (both complex and real), and Hurwitz equivalence of braid monodromy factorizations. The approach relies on a close relation between trigonal curves/elliptic surfaces, a certain class of ribbon graphs, and subgroups of the modular group, which provides a combinatorial framework for the study of geometric objects. A brief summary of the necessary auxiliary results and techniques used and a background of the principal problems dealt with are included in the text. The book is intended to researchers and graduate students in the field of topology of complex and real algebraic varieties.
Issued also in print.
Mode of access: Internet via World Wide Web.
In English.
Description based on online resource; title from PDF title page (publisher's Web site, viewed 28. Feb 2023)
Curves, Plane.
Topological degree.
Algebra.
Surfaces.
Topology.
MATHEMATICS / Topology. bisacsh
Braid Monodromy.
Dessin d’Enfant.
Elliptic Surface.
Fundamental Group.
Lefschetz Fibration.
Modular Group.
Monodromy Factorization.
Plane Sextic.
Real Variety.
Trigonal Curve.
Title is part of eBook package: De Gruyter DG Studies in Mathematics eBook-Package 9783110494938 ZDB-23-GSM
Title is part of eBook package: De Gruyter DGBA Backlist Complete English Language 2000-2014 PART1 9783110238570
Title is part of eBook package: De Gruyter DGBA Backlist Mathematics 2000-2014 (EN) 9783110238471
Title is part of eBook package: De Gruyter DGBA Mathematics - 2000 - 2014 9783110637205 ZDB-23-GMA
Title is part of eBook package: De Gruyter E-BOOK GESAMTPAKET / COMPLETE PACKAGE 2012 9783110288995 ZDB-23-DGG
Title is part of eBook package: De Gruyter E-BOOK PACKAGE MATHEMATICS, PHYSICS, ENGINEERING 2012 9783110293722 ZDB-23-DMI
Title is part of eBook package: De Gruyter E-BOOK PAKET MATHEMATIK, PHYSIK, INGENIEURWISS. 2012 9783110288926 ZDB-23-DMP
print 9783110255911
https://doi.org/10.1515/9783110258424
https://www.degruyter.com/isbn/9783110258424
Cover https://www.degruyter.com/document/cover/isbn/9783110258424/original
language English
format eBook
author Degtyarev, Alex,
Degtyarev, Alex,
spellingShingle Degtyarev, Alex,
Degtyarev, Alex,
Topology of Algebraic Curves : An Approach via Dessins d'Enfants /
De Gruyter Studies in Mathematics ,
Frontmatter --
Preface --
Contents --
Part I. Skeletons and dessins --
Chapter 1. Graphs --
Chapter 2. The groups Γ and B3 --
Chapter 3. Trigonal curves and elliptic surfaces --
Chapter 4. Dessins --
Chapter 5. The braid monodromy --
Part II. Applications --
Chapter 6. The metabelian invariants --
Chapter 7. A few simple computations --
Chapter 8. Fundamental groups of plane sextics --
Chapter 9. The transcendental lattice --
Chapter 10. Monodromy factorizations --
Appendices --
Appendix A. An algebraic complement --
Appendix B. Bigonal curves in Σd --
Appendix C. Computer implementations --
Appendix D. Definitions and notation --
Bibliography --
Index of figures --
Index of tables --
Index
author_facet Degtyarev, Alex,
Degtyarev, Alex,
author_variant a d ad
a d ad
author_role VerfasserIn
VerfasserIn
author_sort Degtyarev, Alex,
title Topology of Algebraic Curves : An Approach via Dessins d'Enfants /
title_sub An Approach via Dessins d'Enfants /
title_full Topology of Algebraic Curves : An Approach via Dessins d'Enfants / Alex Degtyarev.
title_fullStr Topology of Algebraic Curves : An Approach via Dessins d'Enfants / Alex Degtyarev.
title_full_unstemmed Topology of Algebraic Curves : An Approach via Dessins d'Enfants / Alex Degtyarev.
title_auth Topology of Algebraic Curves : An Approach via Dessins d'Enfants /
title_alt Frontmatter --
Preface --
Contents --
Part I. Skeletons and dessins --
Chapter 1. Graphs --
Chapter 2. The groups Γ and B3 --
Chapter 3. Trigonal curves and elliptic surfaces --
Chapter 4. Dessins --
Chapter 5. The braid monodromy --
Part II. Applications --
Chapter 6. The metabelian invariants --
Chapter 7. A few simple computations --
Chapter 8. Fundamental groups of plane sextics --
Chapter 9. The transcendental lattice --
Chapter 10. Monodromy factorizations --
Appendices --
Appendix A. An algebraic complement --
Appendix B. Bigonal curves in Σd --
Appendix C. Computer implementations --
Appendix D. Definitions and notation --
Bibliography --
Index of figures --
Index of tables --
Index
title_new Topology of Algebraic Curves :
title_sort topology of algebraic curves : an approach via dessins d'enfants /
series De Gruyter Studies in Mathematics ,
series2 De Gruyter Studies in Mathematics ,
publisher De Gruyter,
publishDate 2012
physical 1 online resource (393 p.)
Issued also in print.
contents Frontmatter --
Preface --
Contents --
Part I. Skeletons and dessins --
Chapter 1. Graphs --
Chapter 2. The groups Γ and B3 --
Chapter 3. Trigonal curves and elliptic surfaces --
Chapter 4. Dessins --
Chapter 5. The braid monodromy --
Part II. Applications --
Chapter 6. The metabelian invariants --
Chapter 7. A few simple computations --
Chapter 8. Fundamental groups of plane sextics --
Chapter 9. The transcendental lattice --
Chapter 10. Monodromy factorizations --
Appendices --
Appendix A. An algebraic complement --
Appendix B. Bigonal curves in Σd --
Appendix C. Computer implementations --
Appendix D. Definitions and notation --
Bibliography --
Index of figures --
Index of tables --
Index
isbn 9783110258424
9783110494938
9783110238570
9783110238471
9783110637205
9783110288995
9783110293722
9783110288926
9783110255911
issn 0179-0986 ;
callnumber-first Q - Science
callnumber-subject QA - Mathematics
callnumber-label QA567
callnumber-sort QA 3567 D44 42012
url https://doi.org/10.1515/9783110258424
https://www.degruyter.com/isbn/9783110258424
https://www.degruyter.com/document/cover/isbn/9783110258424/original
illustrated Not Illustrated
dewey-hundreds 500 - Science
dewey-tens 510 - Mathematics
dewey-ones 516 - Geometry
dewey-full 516.3/52
dewey-sort 3516.3 252
dewey-raw 516.3/52
dewey-search 516.3/52
doi_str_mv 10.1515/9783110258424
oclc_num 900724366
work_keys_str_mv AT degtyarevalex topologyofalgebraiccurvesanapproachviadessinsdenfants
status_str n
ids_txt_mv (DE-B1597)124045
(OCoLC)900724366
carrierType_str_mv cr
hierarchy_parent_title Title is part of eBook package: De Gruyter DG Studies in Mathematics eBook-Package
Title is part of eBook package: De Gruyter DGBA Backlist Complete English Language 2000-2014 PART1
Title is part of eBook package: De Gruyter DGBA Backlist Mathematics 2000-2014 (EN)
Title is part of eBook package: De Gruyter DGBA Mathematics - 2000 - 2014
Title is part of eBook package: De Gruyter E-BOOK GESAMTPAKET / COMPLETE PACKAGE 2012
Title is part of eBook package: De Gruyter E-BOOK PACKAGE MATHEMATICS, PHYSICS, ENGINEERING 2012
Title is part of eBook package: De Gruyter E-BOOK PAKET MATHEMATIK, PHYSIK, INGENIEURWISS. 2012
is_hierarchy_title Topology of Algebraic Curves : An Approach via Dessins d'Enfants /
container_title Title is part of eBook package: De Gruyter DG Studies in Mathematics eBook-Package
_version_ 1770177496517443584
fullrecord <?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>05684nam a22010455i 4500</leader><controlfield tag="001">9783110258424</controlfield><controlfield tag="003">DE-B1597</controlfield><controlfield tag="005">20230228123812.0</controlfield><controlfield tag="006">m|||||o||d||||||||</controlfield><controlfield tag="007">cr || ||||||||</controlfield><controlfield tag="008">230228t20122012gw fo d z eng d</controlfield><datafield tag="010" ind1=" " ind2=" "><subfield code="a">2012006099</subfield></datafield><datafield tag="019" ind1=" " ind2=" "><subfield code="a">(OCoLC)961678276</subfield></datafield><datafield tag="020" ind1=" " ind2=" "><subfield code="a">9783110258424</subfield></datafield><datafield tag="024" ind1="7" ind2=" "><subfield code="a">10.1515/9783110258424</subfield><subfield code="2">doi</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-B1597)124045</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(OCoLC)900724366</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-B1597</subfield><subfield code="b">eng</subfield><subfield code="c">DE-B1597</subfield><subfield code="e">rda</subfield></datafield><datafield tag="041" ind1="0" ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="044" ind1=" " ind2=" "><subfield code="a">gw</subfield><subfield code="c">DE</subfield></datafield><datafield tag="050" ind1="0" ind2="0"><subfield code="a">QA567</subfield><subfield code="b">.D44 2012</subfield></datafield><datafield tag="050" ind1=" " ind2="4"><subfield code="a">QA567</subfield></datafield><datafield tag="072" ind1=" " ind2="7"><subfield code="a">MAT038000</subfield><subfield code="2">bisacsh</subfield></datafield><datafield tag="082" ind1="0" ind2="4"><subfield code="a">516.3/52</subfield><subfield code="2">23</subfield></datafield><datafield tag="084" ind1=" " ind2=" "><subfield code="a">SK 240</subfield><subfield code="2">rvk</subfield><subfield code="0">(DE-625)rvk/143226:</subfield></datafield><datafield tag="100" ind1="1" ind2=" "><subfield code="a">Degtyarev, Alex, </subfield><subfield code="e">author.</subfield><subfield code="4">aut</subfield><subfield code="4">http://id.loc.gov/vocabulary/relators/aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Topology of Algebraic Curves :</subfield><subfield code="b">An Approach via Dessins d'Enfants /</subfield><subfield code="c">Alex Degtyarev.</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="a">Berlin ;</subfield><subfield code="a">Boston : </subfield><subfield code="b">De Gruyter, </subfield><subfield code="c">[2012]</subfield></datafield><datafield tag="264" ind1=" " ind2="4"><subfield code="c">©2012</subfield></datafield><datafield tag="300" ind1=" " ind2=" "><subfield code="a">1 online resource (393 p.)</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">computer</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">online resource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="347" ind1=" " ind2=" "><subfield code="a">text file</subfield><subfield code="b">PDF</subfield><subfield code="2">rda</subfield></datafield><datafield tag="490" ind1="0" ind2=" "><subfield code="a">De Gruyter Studies in Mathematics ,</subfield><subfield code="x">0179-0986 ;</subfield><subfield code="v">44</subfield></datafield><datafield tag="505" ind1="0" ind2="0"><subfield code="t">Frontmatter -- </subfield><subfield code="t">Preface -- </subfield><subfield code="t">Contents -- </subfield><subfield code="t">Part I. Skeletons and dessins -- </subfield><subfield code="t">Chapter 1. Graphs -- </subfield><subfield code="t">Chapter 2. The groups Γ and B3 -- </subfield><subfield code="t">Chapter 3. Trigonal curves and elliptic surfaces -- </subfield><subfield code="t">Chapter 4. Dessins -- </subfield><subfield code="t">Chapter 5. The braid monodromy -- </subfield><subfield code="t">Part II. Applications -- </subfield><subfield code="t">Chapter 6. The metabelian invariants -- </subfield><subfield code="t">Chapter 7. A few simple computations -- </subfield><subfield code="t">Chapter 8. Fundamental groups of plane sextics -- </subfield><subfield code="t">Chapter 9. The transcendental lattice -- </subfield><subfield code="t">Chapter 10. Monodromy factorizations -- </subfield><subfield code="t">Appendices -- </subfield><subfield code="t">Appendix A. An algebraic complement -- </subfield><subfield code="t">Appendix B. Bigonal curves in Σd -- </subfield><subfield code="t">Appendix C. Computer implementations -- </subfield><subfield code="t">Appendix D. Definitions and notation -- </subfield><subfield code="t">Bibliography -- </subfield><subfield code="t">Index of figures -- </subfield><subfield code="t">Index of tables -- </subfield><subfield code="t">Index</subfield></datafield><datafield tag="506" ind1="0" ind2=" "><subfield code="a">restricted access</subfield><subfield code="u">http://purl.org/coar/access_right/c_16ec</subfield><subfield code="f">online access with authorization</subfield><subfield code="2">star</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">This monograph summarizes and extends a number of results on the topology of trigonal curves in geometrically ruled surfaces. An emphasis is given to various applications of the theory to a few related areas, most notably singular plane curves of small degree, elliptic surfaces, and Lefschetz fibrations (both complex and real), and Hurwitz equivalence of braid monodromy factorizations. The approach relies on a close relation between trigonal curves/elliptic surfaces, a certain class of ribbon graphs, and subgroups of the modular group, which provides a combinatorial framework for the study of geometric objects. A brief summary of the necessary auxiliary results and techniques used and a background of the principal problems dealt with are included in the text. The book is intended to researchers and graduate students in the field of topology of complex and real algebraic varieties.</subfield></datafield><datafield tag="530" ind1=" " ind2=" "><subfield code="a">Issued also in print.</subfield></datafield><datafield tag="538" ind1=" " ind2=" "><subfield code="a">Mode of access: Internet via World Wide Web.</subfield></datafield><datafield tag="546" ind1=" " ind2=" "><subfield code="a">In English.</subfield></datafield><datafield tag="588" ind1="0" ind2=" "><subfield code="a">Description based on online resource; title from PDF title page (publisher's Web site, viewed 28. Feb 2023)</subfield></datafield><datafield tag="650" ind1=" " ind2="0"><subfield code="a">Curves, Plane.</subfield></datafield><datafield tag="650" ind1=" " ind2="0"><subfield code="a">Topological degree.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Algebra.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Surfaces.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Topology.</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">MATHEMATICS / Topology.</subfield><subfield code="2">bisacsh</subfield></datafield><datafield tag="653" ind1=" " ind2=" "><subfield code="a">Braid Monodromy.</subfield></datafield><datafield tag="653" ind1=" " ind2=" "><subfield code="a">Dessin d’Enfant.</subfield></datafield><datafield tag="653" ind1=" " ind2=" "><subfield code="a">Elliptic Surface.</subfield></datafield><datafield tag="653" ind1=" " ind2=" "><subfield code="a">Fundamental Group.</subfield></datafield><datafield tag="653" ind1=" " ind2=" "><subfield code="a">Lefschetz Fibration.</subfield></datafield><datafield tag="653" ind1=" " ind2=" "><subfield code="a">Modular Group.</subfield></datafield><datafield tag="653" ind1=" " ind2=" "><subfield code="a">Monodromy Factorization.</subfield></datafield><datafield tag="653" ind1=" " ind2=" "><subfield code="a">Plane Sextic.</subfield></datafield><datafield tag="653" ind1=" " ind2=" "><subfield code="a">Real Variety.</subfield></datafield><datafield tag="653" ind1=" " ind2=" "><subfield code="a">Trigonal Curve.</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Title is part of eBook package:</subfield><subfield code="d">De Gruyter</subfield><subfield code="t">DG Studies in Mathematics eBook-Package</subfield><subfield code="z">9783110494938</subfield><subfield code="o">ZDB-23-GSM</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Title is part of eBook package:</subfield><subfield code="d">De Gruyter</subfield><subfield code="t">DGBA Backlist Complete English Language 2000-2014 PART1</subfield><subfield code="z">9783110238570</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Title is part of eBook package:</subfield><subfield code="d">De Gruyter</subfield><subfield code="t">DGBA Backlist Mathematics 2000-2014 (EN)</subfield><subfield code="z">9783110238471</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Title is part of eBook package:</subfield><subfield code="d">De Gruyter</subfield><subfield code="t">DGBA Mathematics - 2000 - 2014</subfield><subfield code="z">9783110637205</subfield><subfield code="o">ZDB-23-GMA</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Title is part of eBook package:</subfield><subfield code="d">De Gruyter</subfield><subfield code="t">E-BOOK GESAMTPAKET / COMPLETE PACKAGE 2012</subfield><subfield code="z">9783110288995</subfield><subfield code="o">ZDB-23-DGG</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Title is part of eBook package:</subfield><subfield code="d">De Gruyter</subfield><subfield code="t">E-BOOK PACKAGE MATHEMATICS, PHYSICS, ENGINEERING 2012</subfield><subfield code="z">9783110293722</subfield><subfield code="o">ZDB-23-DMI</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Title is part of eBook package:</subfield><subfield code="d">De Gruyter</subfield><subfield code="t">E-BOOK PAKET MATHEMATIK, PHYSIK, INGENIEURWISS. 2012</subfield><subfield code="z">9783110288926</subfield><subfield code="o">ZDB-23-DMP</subfield></datafield><datafield tag="776" ind1="0" ind2=" "><subfield code="c">print</subfield><subfield code="z">9783110255911</subfield></datafield><datafield tag="856" ind1="4" ind2="0"><subfield code="u">https://doi.org/10.1515/9783110258424</subfield></datafield><datafield tag="856" ind1="4" ind2="0"><subfield code="u">https://www.degruyter.com/isbn/9783110258424</subfield></datafield><datafield tag="856" ind1="4" ind2="2"><subfield code="3">Cover</subfield><subfield code="u">https://www.degruyter.com/document/cover/isbn/9783110258424/original</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">978-3-11-023847-1 DGBA Backlist Mathematics 2000-2014 (EN)</subfield><subfield code="c">2000</subfield><subfield code="d">2014</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">978-3-11-023857-0 DGBA Backlist Complete English Language 2000-2014 PART1</subfield><subfield code="c">2000</subfield><subfield code="d">2014</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_BACKALL</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_CL_MTPY</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_DGALL</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_EBACKALL</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_EBKALL</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_ECL_MTPY</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_EEBKALL</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_ESTMALL</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">EBA_STMALL</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV-deGruyter-alles</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">PDA12STME</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">PDA13ENGE</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">PDA18STMEE</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">PDA5EBK</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">ZDB-23-DGG</subfield><subfield code="b">2012</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">ZDB-23-DMI</subfield><subfield code="b">2012</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">ZDB-23-DMP</subfield><subfield code="b">2012</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">ZDB-23-GMA</subfield><subfield code="c">2000</subfield><subfield code="d">2014</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">ZDB-23-GSM</subfield></datafield></record></collection>