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Ridder, A.C. de (author) report 1990
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Sprengers, C.J. (author), Ridder, A.C. de (author) report 1990
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Gilding, B.H. (author), Kroot, M.P.J.M. (author), Wesseling, J.W. (author), Rooij, N.M. de (author), Streng, J. (author), Bril, J. (author), Postma, L. (author) report 1985
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Verhaeghe, R.J. (author), Tholen, N. (author) report 1983
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Verhaeghe, R.J. (author) report 1978
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Abraham, G. (author), Koenis, J.P. (author), Otten, G.R. (author) report 1975