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Gerritsma, J. (author) journal article 1952
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Gerritsma, J. (author) journal article 1954
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Gerritsma, J. (author) journal article 1955
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Gerritsma, J. (author) journal article 1956
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Jaeger, H.E. (author), de Does, J.Ch. (author), Gerritsma, J. (author) journal article 1957
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Gerritsma, J. (author) journal article 1957
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Gerritsma, J. (author) journal article 1959
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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) journal article 1961
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Gerritsma, J. (author), van den Bosch, J.J. (author), Beukelman, W. (author) journal article 1961
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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 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), Smith, W.E. (author) journal article 1967
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Gerritsma, J. (author), Smith, W.E. (author) journal article 1967