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Steetzel, H.J. (author) report 1986
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report 1986
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report 1985
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Flokstra, C. (author) report 1983
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Flokstra, C. (author) report 1983
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Vries, W.A. de. (author) report 1983
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Koeman, J.W. (author) report 1983
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Flokstra, C. (author) report 1983
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Koeman, J.W. (author) report 1983
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Flokstra, C. (author) report 1982
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Vries, W.A. de (author) report 1981
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Vries, W. de (author) report 1979
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Koeman, J.W. (author) report 1978