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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
document
Sielcken, O.E. (author), Schram, J. (author), Nolte, R.J.M. (author), Schoonman, J. (author), Drenth, W. (author)
journal article 1988
document
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