@inproceedings{LICS-2000-GradelHO,
	author        = "Erich Grädel and Colin Hirsch and Martin Otto",
	booktitle     = "{Proceedings of the 15th Annual IEEE Symposium on Logic in Computer Science}",
	doi           = "10.1109/LICS.2000.855771",
	isbn          = "0-7695-0725-5",
	pages         = "217--228",
	publisher     = "{IEEE Computer Society}",
	title         = "{Back and Forth between Guarded and Modal Logics}",
	year          = 2000,
}