1
Published 1981
2
Published 2001
3
Published 1980
4
5
6
7
8
9
Published 1989
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10
Published 1969
11
12
Published 1999
13
Published 1990
14
Published 1993
15
16
Published 2002
17
Published 1993
18
Published 1995
19
Published 1998
20
Published 1999