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Verheij, H.J. (author), Raven, H.C. (author), Doorn, N. (author), Borsboom, M.J.A. (author), Lambeek, J.J.P. (author) report 2001
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Stelling, G.S. (author), Kester, J.A.T.M. van (author) report 2000
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Verheij, H.J. (author), Raven, H.C. (author), Doorn, N. (author), Borsboom, M.J.A. (author) report 2000
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Verhage, L. (author) report 1980
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Verhage, L. (author) report 1980
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Voogt, W.J.P. de (author) report 1979
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Dingemans, M.W. (author), Vis, F.C. (author) report 1978