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Ludikhuize, D. (author) report 1984
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Ludikhuize, D. (author) report 1983
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Ludikhuize, D. (author) report 1983
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Ludikhuize, D. (author) report 1983
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Jongeling, T.H.G. (author) report 1983
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Jongeling, T.H.G. (author) report 1983
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Heydra, G. (author) report 1982
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Ludikhuize, D. (author) report 1982
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Jong, R.J. de (author) report 1982
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Uwland, J. (author) report 1982
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Kerstma, J. (author) report 1982
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Ludikhuize, D. (author) report 1981
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Haas, R.G. (author) report 1981
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Ludikhuize, D. (author) report 1981
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Ludikhuize, D. (author) report 1981
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Ludikhuize, D. (author) report 1981
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Oudshoorn, C.R.M. (author) report 1981
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Heijdra, G. (author) report 1980
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Jongeling, T.H.G. (author) report 1980
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Haas, R.G. (author) report 1980