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Gerritsma, J. (author) journal article 1991
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Gerritsma, J. (author) journal article 1986
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Gerritsma, J. (author) journal article 1985
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Gerritsma, J. (author) journal article 1985
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Gerritsma, J. (author) journal article 1984
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Gerritsma, J. (author) journal article 1984
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Beukelman, W. (author), Gerritsma, J. (author) journal article 1982
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Gerritsma, J. (author) journal article 1982
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Keuning, Lex J.A. (author), Gerritsma, J. (author) journal article 1982
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Gerritsma, J. (author) journal article 1981
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Gerritsma, J. (author) journal article 1980
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Gerritsma, J. (author) journal article 1976
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Gerritsma, J. (author) journal article 1970
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Gerritsma, J. (author) journal article 1970
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Keuning, Lex A. (author), Gerritsma, J. (author) journal article
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Gerritsma, J. (author), Smith, W.E. (author) journal article 1967
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Gerritsma, J. (author), Smith, W.E. (author) journal article 1967
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Gerritsma, J. (author) journal article 1961
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Gerritsma, J. (author) journal article 1961
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Gerritsma, J. (author), van den Bosch, J.J. (author), Beukelman, W. (author) journal article 1961