Xiaoying Wang, Jianqiang Huang, Zhiqiang Liu and Xiaojing Liu
Information Technology Journal 12 ( 20 ): 5432 - 5439 , 2013
Xiaoying Wang, Wenyan Yuan, Weili Guo and Xiaojing Liu
Journal of Applied Sciences 13 ( 14 ): 2774 - 2780 , 2013