1
2
Article
3
4
5
by Ketola, Mikko
Published 2000
Published 2000
Book
6
7
by Pynsent, Robert B.
Published 1994
Published 1994
Book
8
by Hagen, William W.
Published 1980
Published 1980
Book
9
10
by Pesek, Jan
Published 1998
Published 1998
Book
11
12
13
14
15
16
17
18
19
20