1
by Laver, Michael, 1949-
Published 1990
2
Published 1989
3
Published 1996
4
5
Published 1995
6
by Ploug, Niels
Published 1996
7
Published 1994
8
9
Published 1994
10
by Rohde, David W.
Published 1997
11
12
Published 1997
13
Published 1996
14
Published 1996
15
by Kaase, Max
Published 1995
16
Published 1996
17
Published 1991
18
by Galtung, Johan
Published 1989
19
Published 1990
20
by Andersen, Torben Juul
Published 1990