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References:
[1] NIKODEM K.: K-convex and K-concave set-valued functions. Zeszyty Nauk. Politech. Łódz. Mat. 559 (1989), 1-75.
[2] PSHENICHNYI B.: Convex multivalued mappings and their conjugates. Cybernetics 10 (1974), 453-464.
[3] ROBERTS A. W.-VARBERG D. E.: Convex functions. New York-London, Academic Press, 1973. MR 0442824 | Zbl 0271.26009
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