@inproceedings{CIG-2015-KreveldLM,
	author        = "Marc J. van Kreveld and Maarten Löffler and Paul Mutser",
	booktitle     = "{Proceedings of the 11th Conference on Computational Intelligence and Games}",
	doi           = "10.1109/CIG.2015.7317913",
	isbn          = "978-1-4799-8622-4",
	pages         = "415--422",
	publisher     = "{IEEE}",
	title         = "{Automated puzzle difficulty estimation}",
	year          = 2015,
}