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References:
[1] SKLAR A.: Pгoblem P 168. Aequationes Math., 15, 1977, 297.
[2] ŠARKOVSKIJ A. N.: Co-existence of the cycles of a continuous mapping of the line into itself. Russian. Ukrain. Mat. Žurnal, 16, 1964, 61-71. MR 0159905
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