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Flokstra, C. (author) report 1986
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Hartsuiker, G. (author) report 1984
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Verboom, G.K. (author), Os, A.G. van (author) report 1982
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Lindijer, G.J.H. (author) report 1981
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Perrels, P.A.J. (author) report 1980
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Perrels, P.A.J. (author), Karelse, M. (author) report 1980
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Perrels, P.A.J. (author), Karelse, M. (author) report 1979
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Perrels, P.A.J. (author) report 1979
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Perrels, P.A.J. (author) report 1976
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Vreugdenhil, C.B. (author) report 1975
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Perrels, P.A.J. (author) report 1975