1
published 1992
Journal
2
published 1991
Journal
4
6
published 2018
Kostenfrei, Verlag
Electronic Journal
7
10
published 2016
Volltext, kostenfrei, Verlag
Volltext, EZB
Electronic Journal
11
12
published 2016
Kostenfrei, Verlag
Electronic Journal
13
published 2016
Kostenfrei, Verlag
Electronic Journal