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Keier, H. (author) report 1965
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Keier, H. (author) report 1965
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Keier, H. (author) report 1965
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Drenth, K.F. (author) report 1981
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Aberkrom, P. (author) report 1981
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de Ronde, E. (author) report 1982
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Hiralal, R.R. (author) report 1982
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Hiralal, R.R. (author) report 1982
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Krus, H. (author) report 1984
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Molenaar, A.J. (author) report 1984
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Molenaar, A.J. (author), Oortman Gerlings, J.D. (author) report 1984
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Krus, H. (author) report 1984
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Molenaar, A.J. (author) report 1984
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Krus, H. (author) report 1984
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de Wit, J.B. (author) report 1985
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Kolff, K. (author) report 1985
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den Heier, M. (author) report 1986
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van der Wel, C.F. (author) report 1986
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den Heyer, M. (author), Peyster, J.J.M. (author) report 1986
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van der Wel, C.F. (author) report 1986