Hong Feng Lai, J. L. Hong, Wang Han Jeng. http: //mba.nuu.edu.tw/academic/news.php?Sn=138 Model E-contract Update by Coloured Activity Net. In Proceedings of the 3rd IEEE Asia-Pacific Services Computing Conference, APSCC 2008, Yilan, Taiwan, 9-12 December 2008. pages 488-493, IEEE, 2008. [doi]
Abstract is missing.