1. IM6D
2. IM3D
3. M. Hutchings. 2011. The Mathematics of Rubik's Cube. https://math.berkeley.edu/~hutching/rubik.pdf. (2011). M. Hutchings. 2011. The Mathematics of Rubik's Cube. https://math.berkeley.edu/~hutching/rubik.pdf. (2011).
4. G. Mazzola M. Mannone and Y. Pang. 2016. Cool Math for Hot Music. Springer. G. Mazzola M. Mannone and Y. Pang. 2016. Cool Math for Hot Music. Springer.