@inproceedings{SEFM-2004-MengNB,
	author        = "Sun Meng and Zhang Naixiao and Luís Soares Barbosa",
	booktitle     = "{Proceedings of the Second International Conference on Software Engineering and Formal Methods}",
	doi           = "10.1109/SEFM.2004.28",
	isbn          = "0-7695-2222-X",
	pages         = "164--173",
	publisher     = "{IEEE Computer Society}",
	title         = "{On Semantics and Refinement of UML Statecharts: A Coalgebraic View}",
	year          = 2004,
}