1. College of Computer and Information Technology, Henan Normal University, Xinxiang Henan 453007, China 2. College of Physics and Information Engineering, Henan Normal University, Xinxiang Henan 453007, China
ZHOU Yun ZHAN Hua-wei. Coverage problem of directional sensors in wireless sensor networks[J]. Journal of Computer Applications, 2011, 31(12): 3200-3203.