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document
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Heppe, G. (author), van den Berg, R.P. (author) report 1988
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Wittenberg, H. (author), Korting, P.A.O.G. (author), Wijchers, T. (author), Elands, P.J.M. (author), Dijkstra, F. (author), van den Berg, R.P. (author), van den Brand, J. (author) report 1987
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Versmissen, J. (author), van den Berg, R.P. (author) report 1987
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Merkx, A.W. (author), van den Berg, R.P. (author) report 1986
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van den Berg, P.M. (author) public lecture 1982
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van den Berg, P.M. (author) journal article 1976