Jun Wang Zhijun Yao Zhi Guo Longjun Qian The Distribution Function of Opportunity-awaiting Time for Random System with Objective Domain. 1014-1018 2008 ICNSC http://dx.doi.org/10.1109/ICNSC.2008.4525365 conf/icnsc/2008 db/conf/icnsc/icnsc2008.html#WangYGQ08