1
by Clayton
Published 1980
2
Published 1987
3
4
5
Published 1995
6
by Oakley
Published 1987
7
Published 1992
8
by Han Jian
Published 2000
9
by Nagogho Astana
Published 1997
10
by Sandrock
Published 2001
11
by Harris
Published 1994
12
by Henderson, 1943-
Published 1996
13
by Strong
Published 1996
14
by Bloom
Published 2001
15
by Micheli
Published 1996
16
17
by Coe
Published 1981
18
by Benyo
Published 1998
19
by Henderson
Published 1999
20
by Noakes
Published 1995