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Gerritsma, J. (author) journal article 1956
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Gerritsma, J. (author) report 1956
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Gerritsma, J. (author) report 1956
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Gerritsma, J. (author) report 1956
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Gerritsma, J. (author) report 1956
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Gerritsma, J. (author) report 1956
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Gerritsma, J. (author) conference paper 1957
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Gerritsma, J. (author) report 1957
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Gerritsma, J. (author) report 1957
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Gerritsma, J. (author) report 1957
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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) report 1958
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Gerritsma, J. (author) report 1958
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Gerritsma, J. (author) report 1958
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Gerritsma, J. (author) report 1958
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Gerritsma, J. (author) report 1959
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Gerritsma, J. (author) report 1959
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Gerritsma, J. (author) report 1959
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Gerritsma, J. (author) report 1959