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Gerritsma, J. (author) report 1959
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Gerritsma, J. (author) journal article 1959
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Gerritsma, J. (author) report 1960
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Gerritsma, J. (author) report 1960
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Gerritsma, J. (author) report 1960
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Bonebakker, J.W. (author), Gerritsma, J. (author) report 1960
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Gerritsma, J. (author) report 1960
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Gerritsma, J. (author), Zunderdorp, H.J. (author) report 1960
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Gerritsma, J. (author) report 1960
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Gerritsma, J. (author) lecture notes 1961
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Gerritsma, J. (author) lecture notes 1961
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Gerritsma, J. (author) public lecture 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) lecture notes 1961
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Gerritsma, J. (author) journal article 1961
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Gerritsma, J. (author) report 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) public lecture 1961
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Gerritsma, J. (author) report 1962