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Beukelman, W. (author), Gerritsma, J. (author) conference paper 1983
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Gerritsma, J. (author) conference paper 1981
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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 1972
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Gerritsma, J. (author) conference paper 1972
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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 1968
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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), 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) conference paper 1957