1
by Egenfeldt-Nielsen
Published 2008
2
by Negrino
Published 2009
3
by BRYANT
Published 1999
4
by BRYANT
Published 1999
5
by Swan
Published 2001
6
Published 1996
7
Published 1997
8
Published 2002
9
by ROBERGE
Published 2001
10
by Hughes
Published 2012
11
by Smith
Published 2012
12
by Atiyah
Published 2006
13
by Saudagaran
Published 2014
14
by Wardlaw
Published 2011
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15
by Passer
Published 2009
16
by Frank
Published 2007
17
by Frank
Published 2007
18
by Enger
Published 2010
19
by Katzenbach
Published 2006
20
Published 2005