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2. Applications of Cayley graphs;Cooperman,1990
3. Handbook of Cubik Math;Frey,1982
4. Isaacs, S., 1981. Lower bounds. http://www.math.rwth-aachen.de/~Martin.Schoenert/Cube-Lovers/Stan_Isaacs__lower_bounds.html
5. Kociemba, H., 2007. Cube Explorer. http://kociemba.org/cube.htm