@inproceedings{STOC-2001-Grohe,
	author        = "Martin Grohe",
	booktitle     = "{Proceedings of the 33rd Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/380752.380805",
	isbn          = "1-58113-349-9",
	pages         = "231--236",
	publisher     = "{ACM}",
	title         = "{Computing crossing numbers in quadratic time}",
	year          = 2001,
}