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Keuning, Lex J.A. (author), Gerritsma, J. (author), van Terwisga, P.F. (author) report 1993
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Gerritsma, J. (author), Keuning, J.A. (author), Versluis, A. (author) conference paper 1992
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Gerritsma, J. (author), Keuning, J.A. (author) journal article 1985
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Gerritsma, J. (author), Keuning, J.A. (author) report 1985
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Gerritsma, J. (author), Keuning, J.A. (author) conference paper 1985
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Keuning, Lex J.A. (author), Gerritsma, J. (author) journal article 1982
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Keuning, Lex A. (author), Gerritsma, J. (author) journal article