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Schaafsma, A.S. (author) report 1993
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Schaafsma, A.S. (author) report 1992
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Taal, W.J. (author) report 1991
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Schaafsma, A.S. (author) report 1991
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Wenneker, J.C.A. (author), Schaafsma, A.S. (author) report 1990
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Schaafsma, A.S. (author), Bronsveld, J. (author), Pot, J. van der (author), Veger, D. (author) report 1988
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Schaafsma, A.S. (author), Bronsveld, J. (author), Pot, J. van der (author), Veger, D. (author) report 1987
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Schaafsma, A.S. (author) report 1985
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Kinderen, W.J.G.J. der (author) report 1982