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- Keuning, Lex J.A. (author), Onnink, Ruud (author), Damman, Alwin (author) conference paper 2001
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- Keuning, Lex J.A. (author), Onnink, Ruud (author), Damman, A. (author) conference paper 2000
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- Onnink, Ruud (author) report 2000
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- Keuning, Lex J.A. (author), Onnink, R. (author), Versluis, A. (author), van Gulik, A.A.M. (author) conference paper 1997
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- Onnink, Ruud (author) report 1994
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- Onnink, Ruud (author) report 1991
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- Pinkster, Jo A. (author), Onnink, Ruud (author) report 1991
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- Onnink, Ruud (author) report 1990
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- Onnink, Ruud (author) report 1990
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- Onnink, Ruud (author) report 1990
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- Onnink, Ruud (author) report 1986
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- Onnink, Ruud (author) report 1984
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- Onnink, Ruud (author) report 1983
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- Onnink, Ruud (author) report 1980
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- Onnink, Ruud (author) report 1980
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- Onnink, Ruud (author) report 1978
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- Onnink, Ruud (author) report 1978
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- Onnink, Ruud (author) report 1976