- document
- Gerritsma, J. (author), Keuning, J.A. (author), Versluis, A. (author) conference paper 1992
- document
- Keuning, Lex J.A. (author) conference paper 1992
- document
- Keuning, Jelle P.J. (author), van der Werff, T.F. (author) conference paper 1990
- document
- Keuning, Lex J.A. (author) conference paper 1986
- document
- Gerritsma, J. (author), Keuning, J.A. (author) conference paper 1985
- document
- Keuning, Lex J.A. (author) conference paper 1979
- document
- Beukelman, Wim (author), Keuning, Lex (author) conference paper 1975