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Gerritsma, J. (author)
report 1975
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Gerritsma, J. (author)
report 1968
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Gerritsma, J. (author)
report 1983
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Gerritsma, J. (author)
report 1983
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Gerritsma, J. (author)
report 1986
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Keuning, Lex J.A. (author), Gerritsma, J. (author), van Terwisga, P.F. (author)
report 1993
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Gerritsma, J. (author)
report 1984
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Gerritsma, J. (author)
report 1989
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Gerritsma, J. (author)
report 1985
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Gerritsma, J. (author)
report 1973
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Gerritsma, J. (author), Beukelman, W. (author)
report 1967
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Gerritsma, J. (author)
report 1983
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Gerritsma, J. (author)
report 1982
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Gerritsma, J. (author)
report 1986
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Gerritsma, J. (author)
report 1981
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Gerritsma, J. (author)
report 1956
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Gerritsma, J. (author), Visser, H. (author), Schneiders, C.C.M. (author)
report 1951
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Gerritsma, J. (author)
report 1969
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Gerritsma, J. (author)
report 1983
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Dobson, R.J.C. (author), Gerritsma, J. (author), Veldhuyzen, J.P. (author)
report 1953
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