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Published: 1938
Superior document: Acta Jutlandica 10,1
2
3
Published: 1994.
Superior document: Memoirs of the American Mathematical Society, Volume 111, Number 532
4
Published: c2010.
Superior document: Public worlds ; v. 17
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5
Published: [2019]
Superior document: Title is part of eBook package: De Gruyter DGBA Reference Works <1990
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