1
Published 1997
2
Published 2007
3
4
Published 1994
5
by Caillaud, C.
Published 2007
6
Published 2004
7
Published 2003
8
by Wells, Stanley.
Published 1998
9
by Seely, John
Published 2002
10
by Rogak, Lisa
Published 2005
11
12
by Chin, Soek Hock
Published 2006
13
by Fidelis, Fabian
Published 2005
14
15
by Liu, Yong
Published 1996
16
by Liu, Yong
Published 1998
17
by Tao, Jie
Published 1995
18
Published 1999
19
Published 2008
20
by Cox, Michael
Published 2009