@BOOK {
	EDITOR = "Romain Robbes and Anthony Cleve",
	TITLE = "Proceedings of the 12th International Workshop on Principles of Software Evolution (IWPSE)",
	MONTH = "Sep",
	YEAR = "2011",
	ADDRESS = "Szeged, Hungary",
	PUBLISHER = "ACM Press",
	ISBN = "978-1-4503-0848-9",
	}