61
Published 1991
62
Published 1994
63
by Allahyari, Houchang
Published 1999
64
65
Published 2000
66
Published 1996
67
Published 1996
68
Published 1997
69
Published 1997
70
by Kind, Uwe
Published 2004
71
72
Published 1990
73
Published 2001
74
75
Published 2002
76
Published 2011
77
Published 2014
78
by Ashwell, Paul
Published 2001
79
Published 2006
80
by Pearson, David
Published 2001