@inproceedings{LICS-2007-CateBV,
	author        = "Balder ten Cate and Johan van Benthem and Jouko A. Väänänen",
	booktitle     = "{Proceedings of the 22nd IEEE Symposium on Logic in Computer Science}",
	doi           = "10.1109/LICS.2007.29",
	isbn          = "0-7695-2908-9",
	pages         = "280--292",
	publisher     = "{IEEE Computer Society}",
	title         = "{Lindstrom theorems for fragments of first-order logic}",
	year          = 2007,
}