1
2
Published 2005
3
Published 2005
4
by Yang
Published 1996
5
by Pedersen
Published 2012
6
by Kenyon
Published 2004
7
by Schoenfeld
Published 2006
8
Published 2005
9
by Howley
Published 2007
10
Published 2006
11
by Rikli
Published 2001
12
by Whitfield
Published 2008
13
Published 1997
14
Published 2008
15
by Ebadi
Published 2008
16
Published 2005
17
by Smith
Published 1994
18
19
by Wyatt
Published 2005
20
by Bartlett
Published 2002