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de Heer, Piet W. (author) report 1991
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de Heer, Piet W. (author) report 1991
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de Heer, Piet W. (author) report 1990
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de Heer, Piet W. (author) report 1990
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de Heer, Piet W. (author) report 1989
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Keuning, Lex J.A. (author) report 1988
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Journee, Johan M.J. (author) report 1988
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de Heer, Piet W. (author) report 1988
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de Heer, Piet W. (author) report 1987
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Keuning, Lex J.A. (author) report 1985
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Gerritsma, J. (author), Keuning, J.A. (author) report 1985
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Gerritsma, J. (author) report 1984
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de Heer, Piet W. (author) report 1982
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Gerritsma, J. (author) report 1979
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Meijer, M.C. (author) report 1978
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Gerritsma, J. (author) report 1977
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de Zwaan, Anton P. (author) report 1977
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de Zwaan, Anton P. (author) report 1977
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Ooms, J. (author) report 1976
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Sukselainen, Juhani (author) report 1975