1
published 2012
Journal
2
published 2007
Journal
3
published 2004
Journal
4
published 2004
Journal
5
published 2003
Journal
6
published 2002
Journal
7
8
published 2000
Newspaper
9
published 1999
Journal
10
published 1999
Journal
11
12
Journal
13
published 1998
Journal
15
Published in Maschen-Industrie (1996)
Journal
17
published 1996
Journal
18
published 1996
Journal
19
published 1995
Journal
20
published 1995
Journal