1
by Hirsch
Published 2000
2
Published 1975
3
by Cohen
Published 1979
4
5
by Ratnam
Published 2004
6
Published 1995
7
Published 2007
8
9
by Chalmers
Published 1990
10
Published 2009
11
Published 2009
12
by Brase
Published 2013
13
by Giordano
Published 2014
14
15
by Gilat
Published 2005
16
by Abdullah
Published 2005
17
by Steinhardt
Published 2007
18
by Baykoucheva
Published 2015
19
20
by Verstraete
Published 2008