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Keuning, J.A. (author), Kapsenberg, G.K. (author) report
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Keuning, J.A. (author) report
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Keuning, Lex A. (author), Gerritsma, J. (author) journal article
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Keuning, Lex J.A. (author) report 1973
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Beukelman, Wim (author), Keuning, Lex (author) conference paper 1975
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Keuning, Jelle P.J. (author) report 1976
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Keuning, Lex J.A. (author) doctoral thesis 1977
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Keuning, Lex J.A. (author) conference paper 1979
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Keuning, Lex J.A. (author) report 1979
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Journee, Johan M.J. (author), Keuning, P.J. (author), Vis, F.C. (author) report 1980
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Keuning, Lex J.A. (author) report 1981
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Keuning, Lex J.A. (author) report 1981
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Keuning, Lex J.A. (author), Gerritsma, J. (author) journal article 1982
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Beukelman, W. (author), Keuning, P.J. (author), Huijsmans, R.H.M. (author) report 1983
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Beukelman, W. (author), Huijsmans, R.H.M. (author), Keuning, P.J. (author) journal article 1983
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Keuning, Jelle P.J. (author), Journee, J.M.J. (author) report 1983
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Keuning, J.A. (author) report 1984
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Keuning, Lex J.A. (author) report 1984
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Keuning, Lex J.A. (author) journal article 1984
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Keuning, Lex J.A. (author) report 1984
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