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Valk, C.F. de (author) report 1996
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Valk, C.F. de (author) report 1995
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Valk, C.F. de (author), Petit, H.A.H. (author) report 1995
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Valk, C.F. de (author) report 1994
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Valk, C.F. de (author) report 1994
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Valk, C.F. de (author), Otta, A.K. (author) report 1993
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Valk, C.F. de (author) report 1993
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Valk, C.F. de (author) report 1992
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Valk, C.F. de (author), Zitman, T.J. (author) report 1992
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Valk, C.F. de (author) report 1991
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Valk, C.F. de (author) report 1991
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Valk, C. de (author) report 1988
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Wensink, G.J. (author), Valk, C. de (author) report 1987