Huijuan Wu, Zinan Wang, Fei Peng, Zhengpu Peng, Xiaoyu Li, Yu Wu, Yunjiang Rao, "Field test of a fully distributed fiber optic intrusion detection system for long-distance security monitoring of national borderline," Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 915790 (2 June 2014);