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Gerritsma, J. (author)
report 1989
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Gerritsma, J. (author)
report 1988
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Gerritsma, J. (author)
report 1987
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Gerritsma, J. (author)
report 1987
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Gerritsma, J. (author)
report 1987
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Gerritsma, J. (author)
report 1987
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Gerritsma, J. (author)
report 1986
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Gerritsma, J. (author)
report 1986
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Gerritsma, J. (author)
report 1985
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Gerritsma, J. (author)
report 1985
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Gerritsma, J. (author)
report 1985
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Gerritsma, J. (author)
report 1984
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Gerritsma, J. (author)
report 1983
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Gerritsma, J. (author)
report 1983
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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 1971
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