@article{liapis2015ecj,
	author = {Antonios Liapis and Georgios N. Yannakakis and Julian Togelius},
	title = {Constrained Novelty Search: A Study on Game Content Generation},
	journal = {Evolutionary Computation},
	volume = {23},
	number = {1},
	pages = {101-129},
	year = {2015},
}