@inproceedings{TOOLS-USA-2001-HeSH,
	author        = "Yanxiang He and Qiang Song and Qian Huang",
	booktitle     = "{Proceedings of the 39th International Conference on Technology of Object-Oriented Languages and Systems}",
	doi           = "10.1109/TOOLS.2001.941678",
	isbn          = "0-7695-1251-8",
	pages         = "253--262",
	publisher     = "{IEEE Computer Society}",
	title         = "{Extensions of Standard Z Refinement Relation for Multiple Viewpoints Oriented Requirements Method}",
	year          = 2001,
}