61
Published 1990
62
63
64
Published 2000
65
Published 1998
66
Published 1996
67
Published 1982
68
69
70
by Wang, Jie.
Published 1990
71
72
by Lobo
73
Published 1985
74
Published 2000
75
76
by Zheng, Shao Qiu
Published 1977
77
Published 1991
78
Published 1995
79
by Sirkin, Arlene Farber.
Published 1993
80