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de Zwaan, A.P. (author), Pijfers, J.G.L. (author) report 1982
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de Zwaan, A.P. (author), Pijfers, J.G.L. (author) report 1978
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Pijfers, Jan G.L. (author) conference paper 1977
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Pijfers, Jan G.L. (author) report 1976
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Pijfers, Jan G.L. (author) report 1975
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Pijfers, Jan G.L. (author) master thesis 1975
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Pijfers, Jan G.L. (author) report 1974
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Pijfers, Jan G.L. (author) report 1971
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Vugts, Jan H. (author), Pijfers, Jan G.L. (author) report 1971