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- van der Werff, T.F. (author), Keuning, P.J. (author) report 1988
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- Bles, Wim (author), Boer, L.C. (author), Keuning, J.A. (author), Vermey, P. (author), Wientjes, C.J.E. (author) report 1988
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- Keuning, Lex J.A. (author) report 1986
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- Beukelman, Wim (author), Keuning, Lex (author) report 1986
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- Keuning, Lex J.A. (author) report 1986
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- Keuning, Lex J.A. (author) report 1986
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- Keuning, Lex J.A. (author) report 1985
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- Beukelman, Wim (author), Keuning, Lex (author) report 1985
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- Keuning, Lex J.A. (author) report 1985
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- Gerritsma, J. (author), Keuning, J.A. (author) report 1985
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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) report 1984
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- Beukelman, W. (author), Keuning, P.J. (author), Huijsmans, R.H.M. (author) report 1983
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- Keuning, Jelle P.J. (author), Journee, J.M.J. (author) report 1983
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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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- 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 1979
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- Keuning, Jelle P.J. (author) report 1976