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- Blok, Jan J. (author) report 1985
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- Blok, Jan J. (author) report 1985
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- Blok, Jan J. (author) report 1985
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- Blok, Jan J. (author), Huisman, J. (author) report 1984
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- Blok, Jan J. (author), Beukelman, Wim (author) conference paper 1984
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- Blok, Jan J. (author) report 1984
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- Blok, Jan J. (author) report 1984
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- Blok, Jan J. (author) report 1983
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- Blok, Jan J. (author) report 1983
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- Blok, Jan J. (author) report 1983
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- Blok, Jan J. (author) report 1981
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- Blok, Jan J. (author), Dekker, J.N. (author) journal article 1980
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- Blok, Jan J. (author) report 1979
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- Blok, J.K. (author) master thesis 1978
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- Blok, Jan J. (author) report 1977
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- Blok, Jan J. (author) report 1975
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- Blok, Jan J. (author) master thesis 1974
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