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Sybesma, R.P (author)
report 1961
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Ligteringen, H. (author)
report 1974
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Wijngaarden, N.J. van (author)
report 1976
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Roelfzema, A. (author)
report 1977
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Heydra, G. (author)
report 1977
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Hartsuiker, G. (author)
report 1977
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Kuur, P. van der (author)
report 1977
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Heydra, G. (author)
report 1977
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Kuur, P. van der (author)
report 1978
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Casteleyn, J.A. (author)
report 1978
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Casteleyn, J.A. (author)
report 1978
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Casteleyn, J.A. (author)
report 1978
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Casteleyn, J.A. (author)
report 1979
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Casteleijn, J.A. (author)
report 1979
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Casteleyn, J.A. (author)
report 1979
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Heydra, G. (author)
report 1979
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Kerstma, J. (author)
report 1979
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Kuur, P. van der (author)
report 1979
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Ludikhuize, D. (author)
report 1980
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Haas, R.G. (author)
report 1980
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