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Sielcken, O.E. (author), Drenth, W. (author), Schoonman, J. (author), Schram, J. (author), Nolte, R.J.M. (author)
journal article 1987
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Sielcken, O.E. (author), Schram, J. (author), Nolte, R.J.M. (author), Schoonman, J. (author), Drenth, W. (author)
journal article 1988
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Sielcken, O.E. (author), Vanlindert, H.C.A. (author), Drenth, W. (author), Schoonman, J. (author), Schram, J. (author), Nolte, R.J.M. (author)
journal article 1989
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Sielcken, O.E. (author), Nolte, R.J.M. (author), Schoonman, J. (author)
journal article 1990
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