1
Published 1987
Book
2
Published 1999
Book
3
Published 1995
Book
4
Published 1995
Book
5
Published 1999
Book
6
Published 1975
Book
7
Published 1977
Book
9
Published 1970
Book
10
Published 2000
Book
11
Published 1996
Book
13
Book
14
16
by Schäfer, Harald
Published 1996
Book
17
Published 1992
Book
18
Published 1990
Book
19
Book
20
Published 1994
Book