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Duchateau, E.A.E. (author), van Oers, B.J. (author), Hopman, J.J. (author) journal article 2013
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Koning Gans, Henk J. (author) journal article 2001
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Keuning, Lex J.A. (author) journal article 2000
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Kühn, Martin (author) journal article 1994
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Keuning, Lex J.A. (author) journal article 1985
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Keuning, Lex J.A. (author) journal article 1984
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Glansdorp, C.C. (author) journal article 1972
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Gerritsma, J. (author) journal article 1965
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Gerritsma, J. (author) journal article 1965
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Gerritsma, J. (author) journal article 1965
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Gerritsma, J. (author) journal article 1965
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Gerritsma, J. (author), Beukelman, W. (author) journal article 1963
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Gerritsma, J. (author) journal article 1963
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Gerritsma, J. (author), Beukelman, W. (author) journal article 1963
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Gerritsma, J. (author) journal article 1961
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Havelock, Th.H. (author) journal article 1909