@inproceedings{ECOOP-2007-LuPX,
	author        = "Yi Lu and John Potter and Jingling Xue",
	booktitle     = "{Proceedings of the 21st European Conference on Object-Oriented Programming}",
	doi           = "10.1007/978-3-540-73589-2_11",
	editor        = "Erik Ernst",
	isbn          = "978-3-540-73588-5",
	pages         = "202--226",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Validity Invariants and Effects}",
	volume        = 4609,
	year          = 2007,
}