21
Published 1989
22
Published 1990
23
Published 1990
24
Published 1990
25
by Muni, S. D.
Published 1993
26
by Wijesinha Rajiva
Published 1986
27
by Kessler, Martha
Published 1987
28
by Hull, Richard W.
Published 1981
29
Published 1996
30
Published 1991
31
Published 1991
32
by Nelson, Jack
Published 1993
33
by Ryan, Stephen
Published 1990
34
35
Published 1993
36
Published 1993
37
Published 1989
38
by Friedland, Roger
Published 1996
39
Published 1988
40
by Botoran, Constantin
Published 1993