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