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- Keuning, J.A. (author), Vermeulen, K.J. (author) report 2002
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- Keuning, J.A. (author) report 2001
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- Keuning, Lex J.A. (author), Vermeulen, Kees Jan (author) report 2001
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- Keuning, Lex J.A. (author) report 2000
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- Keuning, Lex J.A. (author), Sonnenberg, Uco B. (author) report 1999
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- Keuning, Lex J.A. (author), van Gulik, A.A.M. (author) report 1998
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- Keuning, Lex J.A. (author) report 1998
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- Keuning, Lex J.A. (author) report 1997
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- Keuning, Lex J.A. (author) report 1997
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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 1989
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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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- Keuning, Lex J.A. (author) report 1988
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- van der Werff, T.F. (author), Keuning, P.J. (author) report 1988