1
Published 2008
2
3
Published 1993
4
Published 1987
5
6
by Stanfielda
Published 1993
7
by Keyes
Published 1995
8
by Gibson
Published 2007
9
10
Published 1991
11
by Nagata
Published 1979
12
by Chang, 1959-
Published 1992
13
by Bradley
Published 2007
14
Published 2006
15
Published 1976
16
by Hew
Published 2003
17
by Burgess
Published 1990
18
Published 1991
19
Published 1992
20
by Hammersley
Published 1989