1
Book
2
3
4
Book
5
6
Book
7
Book
8
Published: Bochum : VAPET, 1989-1996
Journal
9
Published: Frankfurt a.M. : Zweitausendeins, 1978
Book
10
11
Published: Marbach, 1995.
Book
12
Book
13
Book
14
15
Book
16
Book
17
Published: Bremen : WWA-Verl, 1984.
Book
18
19
Book
20