MathSciNet bibliographic data MR2036385 (2004m:54028) 54C60 (47H10 54H20 54H25) Nadler, Sam B., Jr. Periodic points of multi-valued $\epsilon$$\epsilon$-contractive maps. Topol. Methods Nonlinear Anal. 22 (2003), no. 2, 399–409. Journal

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