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Gerritsma, J. (author) journal article 1991
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Gerritsma, J. (author) report 1990
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Gerritsma, J. (author) conference paper 1990
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Gerritsma, J. (author) public lecture 1989
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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1989
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Gerritsma, J. (author) report 1989
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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 1988
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Gerritsma, J. (author) report 1988
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Gerritsma, J. (author) report 1988
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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