@article {Gao20051,
	title = {Geo-workflow model based on Petri nets},
	journal = {Jisuanji Gongcheng/Computer Engineering},
	volume = {31},
	number = {16},
	year = {2005},
	note = {施引文献 3},
	pages = {1-3},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-24344491217\&partnerID=40\&md5=a9bf055c76b37df411256b1e0b7554c4},
	author = {Y. Gao and Y. Liu and L. Wu}
}
