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Keuning, Lex J.A. (author) report 1996
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Keuning, Lex J.A. (author) report 1996
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Keuning, Lex J.A. (author) report 1995
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Keuning, Lex J.A. (author), Onnink, Ruud (author) report 1995
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Keuning, Lex J.A. (author), Gerritsma, J. (author), van Terwisga, P.F. (author) report 1993
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Bles, W. (author), Keuning, J.A. (author), Ooms, J. (author), Wientjes, C.J.E. (author) report 1991
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Keuning, Lex J.A. (author) report 1988
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Keuning, Lex J.A. (author) report 1988
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Bles, Wim (author), Boer, L.C. (author), Keuning, J.A. (author), Vermey, P. (author), Wientjes, C.J.E. (author) report 1988
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Keuning, Lex J.A. (author) report 1986
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Beukelman, Wim (author), Keuning, Lex (author) report 1986
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Keuning, Lex J.A. (author) report 1986
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Keuning, Lex J.A. (author) report 1986
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Beukelman, Wim (author), Keuning, Lex (author) report 1985
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Keuning, J.A. (author) report 1984
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Keuning, Lex J.A. (author) report 1984
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Keuning, Lex J.A. (author) report 1984
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Beukelman, W. (author), Keuning, P.J. (author), Huijsmans, R.H.M. (author) report 1983
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Keuning, Jelle P.J. (author), Journee, J.M.J. (author) report 1983
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Keuning, Lex J.A. (author) report 1981