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Part of this paper was written while the author was a member of the Sonderforschungsbereich 72 der Universität Bonn
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Stegall, C. Optimization of functions on certain subsets of Banach spaces. Math. Ann. 236, 171–176 (1978). https://doi.org/10.1007/BF01351389
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DOI: https://doi.org/10.1007/BF01351389