References

[AkgunDM+19]Özgür Akgün, Nguyen Dang, Ian Miguel, András Z. Salamon, and Christopher Stone. Instance generation via generator instances. In Thomas Schiex and Simon de Givry, editors, CP 2019: Proceedings of the 25th International Conference on Principles and Practice of Constraint Programming, volume 11802 of Lecture Notes in Computer Science, 3–19. Springer, 2019. doi:10.1007/978-3-030-30048-7_1.
[CDDC+19]Sara Ceschia, Nguyen Dang, Patrick De Causmaecker, Stefaan Haspeslagh, and Andrea Schaerf. The second international nurse rostering competition. Annals of Operations Research, 274:171–186, 2019. doi:10.1007/s10479-018-2816-0.
[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.