Jürgen Hardt
![](https://upload.wikimedia.org/wikipedia/commons/4/49/2014-09-09_-_J%C3%BCrgen_Hardt_MdB_-_6879.jpg)
1
Published: 2009.
2
Published: [2016]
Superior document: Title is part of eBook package: De Gruyter DG Plus DeG Package 2017 Part 1
Links: Get full text; Get full text; Cover
3
Published: 2014
4
Published: 2010