Robert Baier, Elza Farkhi. Regularity of set-valued maps and their selections through set differences. Part 1: Lipschitz continuity.
Serdica Mathematical Journal, Bulgarian Academy of Sciences, 2013, Special volume dedicated to the 65th Anniversary of Professor Asen L. Dontchev and to the 60th Anniversary Professor Vladimir M. Veliov, 39 (3-4), pp.365-390.
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