61
by Elon
Published 1983
62
by Gomez
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63
Published 2002
64
Published 2006
65
Published 2009
66
by Coffey
Published 2008
67
by Vaughan-Lee,\
Published 2012
68
69
Published 2010
70
by Badri
Published 1989
71
72
Published 2009
73
by Coolidge
Published 2009
74
75
76
77
78
by Bain
Published 2012
79
80
by Gold}hLiza H.
Published 2013