- document
- Jansen, C.M.A. (author), Hengst, S. (author) other 1998
- document
- Hengst, S. (author) other 1996
- document
- Hengst, S. (author), Leissner, D. (author) other 1995
- document
- Wertheim, A.H. (author) other 1994
- document
- Nikiforov, V. (author) other 1993
- document
- Hengst, S. (author) other 1991
- document
- Tebodin (author) other 1990