1. Even permutations as a product of two conjugate cycles
2. Powers of Cycle-Classes in Symmetric Groups
3. Fredlund P. K. (2011). My ultimate commutator challenge—SpeedSolving Puzzles Community. speedsolving.com/threads/my-ultimate-commutator-challenge.29706
4. Godfrey M. (2004). A question about the commutator subgroup—Domain of the Cube Forum. forum.cubeman.org/?q = node/view/15
5. Commutators and commutator subgroups