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E. R. Van Kampen, The topological transformations of a simple closed curve onto itself, Amer. J. Math. 57 (1935), 142-152. MR 1507062

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S. M. Ulam, Problems in modern mathematics, Wiley, New York, 1964. MR 0280310 (43:6031)

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A. I. Khinchin, Mathematical foundations of information theory, Dover, New York, 1957. MR 0092709 (19:1148f)

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