1
by Christen, P., Hofmann, E.
Published 1989
Springer Berlin Heidelberg

2
by Christen, P., Hofmann, E.
Published 1997
Springer Berlin Heidelberg

3
by Christen, P., Hofmann, E.
Published 1996
Springer Berlin Heidelberg

4
by Christen, P., Hofmann, E.
Published 1993
Springer Berlin Heidelberg

5
by Christen, P., Hofmann, E.
Published 1994
Springer Berlin Heidelberg

6
by Christen, P., Hofmann, E.
Published 1995
Springer Berlin Heidelberg