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Gerritsma, J. (author) journal article 1977
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Gerritsma, J. (author) journal article 1965
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Gerritsma, J. (author), Keuning, J.A. (author) journal article 1985
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Gerritsma, J. (author) journal article 1986
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Gerritsma, J. (author) journal article 1982
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Gerritsma, J. (author) journal article 1965
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Gerritsma, J. (author) journal article 1978
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Gerritsma, J. (author) journal article 1980
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Gerritsma, J. (author), Beukelman, W. (author) journal article 1963
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Gerritsma, J. (author) journal article 1970
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Gerritsma, J. (author) journal article 1956
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Gerritsma, J. (author) journal article 1970
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Gerritsma, J. (author) journal article 1963
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Gerritsma, J. (author), Moeyes, G. (author) journal article 1973
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Gerritsma, J. (author) journal article 1961
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Beukelman, W. (author), Gerritsma, J. (author) journal article 1982
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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 1986
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Gerritsma, J. (author) journal article 1961