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Ludikhuize, D. (author) report 1983
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Kerstma, J. (author) report 1982
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Ludikhuize, D. (author) report 1980
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Kerstma, J. (author) report 1979
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Heydra, G. (author) report 1979
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Casteleyn, J.A. (author) report 1979
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Casteleijn, J.A. (author) report 1979
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Casteleyn, J.A. (author) report 1978
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Casteleyn, J.A. (author) report 1978
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Kuur, P. van der (author) report 1978
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Heydra, G. (author) report 1977