@inproceedings{STOC-2000-Gutierrez,
	author        = "Claudio Gutiérrez",
	booktitle     = "{Proceedings of the 32nd Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/335305.335308",
	isbn          = "1-58113-184-4",
	pages         = "21--27",
	publisher     = "{ACM}",
	title         = "{Satisfiability of equations in free groups is in PSPACE}",
	year          = 2000,
}