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Gerritsma, J. (author) report 1960
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den Hartigh, T. (author) report 1968
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Blaauw, E.M. (author) report 1968
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van Galen, J.S. (author) report 1968
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Tuinman, W. (author) report 1968
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van Vliet, P. (author) report 1968
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Dingemans, S. (author) report 1969
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de Groot, J.D. (author) report 1969
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Hertogh, G.J.M. (author) report 1969
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Winkler, M.F. (author) report 1969
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Nuijten, J.A.A. (author), Tanis, J.L. (author) report 1969
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van der Plas, B. (author) report 1969
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Blankestijn, E.P. (author) report 1969
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van der Kooij, J. (author) report 1969
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Visscher, J.W. (author) report 1969
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Buis, J. (author) report 1969
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Jonker, B.L. (author) report 1969
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Jansen, A.J. (author) report 1970
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Zondervan, S.P.C. (author) report 1970
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van Wijk, C.M.A. (author) report 1970