1
Published in 1990
2
Published in 1989
3
Published in 1993
4
Published in 1989
5
6
Published in 1996
7
Published in 1996
8
Published in 1991
9
Published in 1997
10
Published in 1983
journal article
11
Published in 1986
12
Published in 1993
13
Published in 1995
14
Published in 1995
journal article
15
Published in 1986
16
Published in 1996
17
Published in 1986
18
Published in 1990
19
Published in 1995
20
Published in 1998