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The research of this author was supported by the United States Air Force Office of Scientific Research, under AFOSR Grant no. 1109-66.
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Blatter, J., Morris, P.D. & Wulbert, D.E. Continuity of the set-valued metric projection. Math. Ann. 178, 12–24 (1968). https://doi.org/10.1007/BF01350621
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DOI: https://doi.org/10.1007/BF01350621