1
2
Published 2004
3
4
5
by Meilaender
Published 2005
6
by Gill
Published 2006
7
by Horn
Published 2003
8
by Ackerman
Published 1989
9
Published 2001
10
by Appelbe
Published 1993
11
Published 2009
12
Published 2006
13
by Sachedina, 1942-
Published 2009
14
by McQueen
Published 2009
15
16
17
18
by Baron, 1944-
Published 2006
19
by Veatch
Published 1977
20
by Fisher
Published 2012