- document
- Hengst, Sjoerd (author) report 2001
- document
- Hengst, Sjoerd (author) report 2001
- document
- Stavenuiter, J. (author), Hengst, S. (author) report 1999
- document
- Hengst, S. (author), Koppies, J.D.M. (author) report 1996
- document
- Hengst, S. (author), Dirkse, C. (author), Stoop, J. (author), van Poortvliet, A. (author) report 1995
- document
- Hengst, S. (author), Dirkse, C. (author) report 1995
- document
- Hengst, Sjoerd (author) report 1988