- document
- Gerritsma, J. (author) report 1982
- document
- Beukelman, W. (author), Gerritsma, J. (author) report 1982
- document
- Beukelman, W. (author), Gerritsma, J. (author) journal article 1982
- document
- Beukelman, W. (author), Gerritsma, J. (author) report 1982
- document
- Gerritsma, J. (author) report 1982
- document
- Gerritsma, J. (author) journal article 1982
- document
- Keuning, Lex J.A. (author), Gerritsma, J. (author) journal article 1982
- document
- Gerritsma, J. (author) report 1982
- document
- Gerritsma, J. (author) conference paper 1981
- document
- Gerritsma, J. (author) report 1981
- document
- Gerritsma, J. (author) journal article 1981
- document
- Gerritsma, J. (author) lecture notes 1980
- document
- Gerritsma, J. (author) lecture notes 1980
- document
- Gerritsma, J. (author) journal article 1980
- document
- Gerritsma, J. (author) lecture notes 1980
- document
- Gerritsma, J. (author) report 1980
- document
- Gerritsma, J. (author) report 1979
- document
- Gerritsma, J. (author) lecture notes 1979
- document
- Gerritsma, J. (author) report 1978
- document
- Gerritsma, J. (author) report 1978