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document
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Kerdijk, H.N. (author), Sipkema, W. (author), Arkema, P. (author), Smedes, F. (author), Jong, A. de (author) report 1990
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Jong, R.J. de. (author) report 1985
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Jong, R.J. de (author) report 1983
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Jong, R.J. de (author) report 1982
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Jong, R.J. de (author) report 1981
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Jong, R.J. de (author) report 1981
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Jong, R.J. de (author) report 1978
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Jong, R.J. de (author) report 1977
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Jong, R.J. de (author) report 1977
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Jong, R.J. de (author) report 1977
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Jong, R.J. de (author) report 1973