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Gerritsma, J. (author) report 1982
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Beukelman, W. (author), Gerritsma, J. (author) report 1982
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Beukelman, W. (author), Gerritsma, J. (author) report 1982
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Gerritsma, J. (author) report 1982
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Gerritsma, J. (author) report 1982
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Gerritsma, J. (author) report 1982
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Gerritsma, J. (author) report 1982
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Gerritsma, J. (author) report 1982
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Gerritsma, J. (author) report 1981
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Gerritsma, J. (author) report 1981
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Gerritsma, J. (author) report 1981
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Gerritsma, J. (author) report 1981
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Gerritsma, J. (author) report 1980
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Gerritsma, J. (author) report 1980
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Gerritsma, J. (author) report 1979
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Gerritsma, J. (author) report 1979
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Gerritsma, J. (author) report 1978
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Gerritsma, J. (author) report 1978
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Gerritsma, J. (author) report 1978
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Dirkzwager, J.M. (author), Gerritsma, J. (author) report 1978