1
published 2012
Journal
2
published 2008
Journal
3
published 2007
Journal
4
published 2006
Journal
6
published 1997
Journal
7
published 1996
Journal
9
published 1995
Journal
10
published 1993
Journal
11
12
published 1991
Journal
13
published 1987
Journal
14
published 1984
Journal
15
published 1978
Journal
16
published 1976
Journal
17
18
published 1971
Journal
19
Published in In Balance (1971)
Journal
20
published 1967
Journal Conference Proceedings