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document
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De Back, J. (author), Vaessen, G.H.G. (author) report 1984
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document
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de Back, J. (author), Vaessen, G.H.G. (author) report 1981
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document
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De Back, J. (author), Vaessen, G.H.G. (author) report 1981
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document
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de Back, J. (author), Vaessen, G. (author) report 1979
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document
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de Back, J. (author), Vaessen, G. (author) report 1979
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document
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de Back, J. (author), Vaessen, G. (author) report 1979
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document
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de Back, J. (author), Vaessen, G. (author) report 1978
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document
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de Back, J. (author), Vaessen, G. (author) report 1978