An Energy-Efficient Localization Strategy for Smartphones Haifeng Liu; Feng Xia; Zhuo Yang; Yang Cao — 2011 Computer Science and Information Systems
Energy-Efficient Opportunistic Localization with Indoor Wireless Sensor Networks Feng Xia; Xue Yang; Haifeng Liu; Da Zhang; Wenhong Zhao — 2011 Computer Science and Information Systems
Asymptotic behavior of second-order impulsive differential equations. Liu, Haifeng; Li, Qiaoluan — 2011 Electronic Journal of Differential Equations (EJDE) [electronic only]