@inproceedings{SEKE-1995-He,
	author        = "Xudong He",
	booktitle     = "{Proceedings of the Seventh International Conference on Software Engineering and Knowledge Engineering}",
	pages         = "173--180",
	publisher     = "{Knowledge Systems Institute}",
	title         = "{PZ Nets- A Formal Method Integrating Petri Nets with Z}",
	year          = 1995,
}