@inproceedings{LICS-2015-KrebsV,
	author        = "Andreas Krebs and Oleg Verbitsky",
	booktitle     = "{Proceedings of the 30th Annual ACM/IEEE Symposium on Logic in Computer Science}",
	doi           = "10.1109/LICS.2015.69",
	isbn          = "978-1-4799-8875-4",
	pages         = "689--700",
	publisher     = "{IEEE}",
	title         = "{Universal Covers, Color Refinement, and Two-Variable Counting Logic: Lower Bounds for the Depth}",
	year          = 2015,
}