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Meijer, D.G. (author), Ruff, J.F. (author), Verheij, H.J. (author) report 1993
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Meer, J.W. van der (author), Waal, J.P. de (author) report 1993
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Waal, J.P. de (author) report 1993
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Waal, J.P. de (author), Veldman, J.J. (author) report 1991
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Meer, J.W. van der (author) report 1990
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Wal, M. van der (author) report 1989
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Boer, S. (author) report 1989
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Klein Breteler, M. (author) report 1989
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Klein Breteler, M. (author) report 1989
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Anonymus, N.N. (author) report 1977
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Moret, G.E. (author) report 1976
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Jorritsma, J. (author) report 1975