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This paper was written while the author was visiting the Mathematical Institute, Oxford, on leave from the Tata Institute of Fundamental Research, Bombay.
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Roy, A.K. Facial structure of the sum of two compact convex sets. Math. Ann. 197, 189–196 (1972). https://doi.org/10.1007/BF01428225
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DOI: https://doi.org/10.1007/BF01428225