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Spaargaren, D.A. (author) report 1994
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Spaargaren, D.A. (author) report 1994
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Spaargaren, D.A. (author) report 1993
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Schaafsma, A.S. (author) report 1993
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Schaafsma, A.S. (author) report 1992
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Schaafsma, A.S. (author) report 1991
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Taal, W.J. (author) report 1991
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Schaafsma, A.S. (author) report 1991
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Spaargaren, D.A. (author) report 1990
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Gervink, B.J.G.M. (author), Dorenbos, G.J. (author), Berkhoudt, N. (author) report 1989
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Spaargaren, D.A. (author) report 1989
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Haas, R.G. (author) report 1980