- document
- Fokkema, J.T. (author), Dillen, M.W.P. (author), Wapenaar, C.P.A. (author) conference paper 1997
- document
- Fokkema, J.T. (author), Van Vroonhoven, M. (author), Wapenaar, C.P.A. (author), De Bruin, C.G.M. (author) conference paper 1993
- document
- Kremer, S.R.G. (author), Fokkema, J.T. (author), Wapenaar, C.P.A. (author) conference paper 1991
- document
- Fokkema, J.T. (author), Kremer, S.R.G. (author), Wapenaar, C.P.A. (author) conference paper 1990