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Additional information
Translated from Itogi Nauki i Tekhniki, Seriya Sovremennaya Matematika i Ee Prilozheniya. Tematicheskie Obzory, Vol. 22, Dynamical Systems-3, 1995.
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Li, W. Characterization of the rotation set and existence of periodic points of endomorphisms of a circle. J Math Sci 83, 539–542 (1997). https://doi.org/10.1007/BF02434984
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DOI: https://doi.org/10.1007/BF02434984