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- Keuning, Lex J.A. (author) journal article 1989
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- Keuning, H.J. (author) master thesis 1989
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- Keuning, J.A. (author) lecture notes 1989
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- Keuning, Lex J.A. (author) report 1989
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- Keuning, Lex J.A. (author) report 1988
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- Keuning, Lex J.A. (author) report 1988
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- Keuning, Lex J.A. (author) report 1988
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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) lecture notes 1987
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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) conference paper 1986
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- Gerritsma, J. (author), Keuning, J.A. (author) journal article 1985
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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) journal article 1985
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- Keuning, Lex J.A. (author) report 1985