1
by Piegl
Published 1997
2
Published 2010
3
Published 2001
4
by Dix
Published 2008
5
by Dix
Published 2007
6
by Wolf
Published 2009
7
by Yarwood
Published 2007
8
by Ramamurti
Published 2009
9
Published 2004
10
by Brown
Published 2005
11
Published 2006
12
Published 2006
13
by Hoschek
Published 1993
14
by KIRKPATRICK
Published 1997
15
by Brown
16
by HAWKES
Published 1988
17
by OJEDA
Published 1996
18
by RUSHTON
Published 1998
19
by SHEN
Published 2001
20
by CHENG
Published 1997