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- Hoefkens, P.E. (author) report 1992
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- Hoefkens, P.E. (author) report 1992
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- Hoefkens, P.E. (author) master thesis 1992
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- Hoefkens, P.E. (author) report 1992
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- Hogervorst, L.R.A. (author), Hoefkens, P.E. (author) report 1991
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- Hoefkens, P.E. (author) report 1991
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- Hoefkens, P.E. (author) report 1991
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- Hoefkens, P.E. (author) report 1991