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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), Beukelman, W. (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 1963
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Gerritsma, J. (author)
journal article 1961
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Gerritsma, J. (author)
conference paper 1954
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