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de Back, J. (author), Vaessen, G. (author) report 1979
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de Back, J. (author), Vaessen, G. (author) report 1978
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Zoetemeijer, P. (author), de Back, J. (author), Tromp, W.A.J. (author) report 1978
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de Back, J. (author), Vaessen, G. (author) report 1978
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Kolstein, M.H. (author), de Back, J. (author) report 1978
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van Leeuwen, J.L. (author), de Back, J. (author) report 1974
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de Back, J. (author), Zoetemeyer, P. (author) report 1972
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de Back, J. (author), Zoetemeyer, P. (author) report 1972
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de Back, J. (author), den Boer, C. (author) report 1972
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Smits, H,J. (author), de Back, J. (author) report 1971
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Smits, H.J. (author), de Back, J. (author) report 1971
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de Back, J. (author), de Jong, A. (author) report 1968
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de Back, J. (author), Bouwman, L.P. (author) report 1967
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Kuperus, A. (author), de Back, J. (author) report 1967
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de Back, J. (author), Bouwman, L.P. (author) report 1965
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de Back, J. (author) report 1965
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de Back, J. (author), Bouwman, L.P. (author) report 1964
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de Back, J. (author) report 1964
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de Back, J. (author) report 1964
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de Back, J. (author) report 1963