References
- B. Hayes, KenKen friendly numbers, bit-player blog (2010), http://bit-player.org/2010/kenken-friendly-numbers.
- J. Rotman, An Introduction to the Theory of Groups. Springer, New York, 1995.
- E. W. Weisstsein, Latin square, MathWorld—A Wolfram Web Resource, http://mathworld.wolfram.com/LatinSquare.html.