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Gerritsma, J. (author) conference paper 1954
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Gerritsma, J. (author) conference paper 1957
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Gerritsma, J. (author), Beukelman, W. (author) conference paper 1964
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Gerritsma, J. (author), Beukelman, W. (author) conference paper 1964
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Gerritsma, J. (author), Beukelman, W. (author) conference paper 1966
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Gerritsma, J. (author) conference paper 1966
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Gerritsma, J. (author) conference paper 1966
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Gerritsma, J. (author) conference paper 1968
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Gerritsma, J. (author) conference paper 1969
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Gerritsma, J. (author) conference paper 1970
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Gerritsma, J. (author) conference paper 1970
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Gerritsma, J. (author) conference paper 1971
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Moeyes, G. (author), Gerritsma, J. (author), Meijer, M.C. (author) conference paper 1971
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Gerritsma, J. (author) conference paper 1972
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Gerritsma, J. (author) conference paper 1972
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Gerritsma, J. (author) conference paper 1973
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Gerritsma, J. (author) conference paper 1974
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Gerritsma, J. (author) conference paper 1974
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Gerritsma, J. (author) conference paper 1975
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Gerritsma, J. (author) conference paper 1981