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van der Voordt, D.J.M. (author), de Jong, G.E. (author), Drenth, J.G. (author), Nolte, E.A.H. (author), Sanders, L. (author) book 1993
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Aarts, C.G. (author), Drenth, J.G. (author), Nolte, E.A.H. (author), van der Voordt, D.J.M. (author) book 1993
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Kahmann, L.R.M. (author), Nolte, E.A.H. (author), van der Voordt, D.J.M. (author) book 1997
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van der Voordt, D.J.M. (author), Niclaes, M.N. (author), Drenth, J.G. (author), Nolte, E.A.H. (author) book 1995
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van der Voordt, D.J.M. (author), Drenth, J.G. (author), Nolte, E.A.H. (author) report 1996