8Wen Hao, Lin Chang, Chen Zhijia, et al. An improved Markov model for IEEE 802. 15.4 slotted CSMA/CA mechanism [ J]. Journal of Computer Science and Technology, 2009,24 ( 3 ) : 495 -504.
9BRIN S, MOTWANI R, PAGE L, et al. What can you do with a Web in your pocket Bull [ J ]. Data Engineering Bulletin, 1998,21 ( 1 ) :37-47.