References

[Dud24]

H. E. Dudeney. Perplexities. Strand Magazine, 68:94,214, July 1924.

[FHJ+08]

Alan M Frisch, Warwick Harvey, Chris Jefferson, Bernadette Martínez-Hernández, and Ian Miguel. Essence: a constraint language for specifying combinatorial problems. Constraints, 13(3):268–306, 2008. doi:10.1007/s10601-008-9047-y.