@inproceedings{STOC-1975-EvenT,
	author        = "Shimon Even and Robert Endre Tarjan",
	booktitle     = "{Proceedings of the Seventh Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800116.803754",
	pages         = "66--71",
	publisher     = "{ACM}",
	title         = "{a Combinatorial Problem which is Complete in Polynomial Space}",
	year          = 1975,
}