1
by Robinson
Published 2004
2
3
by Kaser
Published 2005
4
by Lussier
Published 2004
5
6
Published 1994
7
by Torkildsen
Published 2005
8
Published 2005
9
by Byl
Published 2006
10
11
Published 2005
12
by Pedersen
Published 2007
13
by Westerbeek
Published 2005
14
by Cochran
Published 2009
15
Published 2008
16
by Smith
Published 2008
17
by Robinson
Published 2010
18
19
by Mohd. Salleh Aman
Published 2006
20
by Jozsa
Published 2011