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REFERENCES
| Dehornoy, Patrick, On the rotation distance between binary trees. Adv. Math. 223 (2010), no. 4, 1316-1355.
D. D. Sleator, R. E. Tarjan and W. P. Thurston, Rotation distance, in T. M. Cover and Gopinath, eds., Open Problems in Communication and Computation, Springer, NY 1987, pp. 130-137.
Sleator, Daniel D.; Tarjan, Robert E.; Thurston, William P. Rotation distance, triangulations and hyperbolic geometry. J. Amer. Math. Soc. 1 (1988), no. 3, 647-681.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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