61
by Barry
Published 1997
62
by Crosby
Published 1984
63
by Hutchins
Published 1994
64
by Logothetis
Published 1992
65
66
by Edvardsson
Published 1994
67
by Sennewald
Published 1978
68
Published 1975
69
by Bank
Published 1992
70
by Price
Published 1993
71
72
by Cali
Published 1992
73
74
75
76
by Khoo, Kheng-Hor
Published 2003
77
by Solomon
Published 1990
78
79
80