White-light Superflare and Long-term Activity of the Nearby M7-type Binary EI Cnc Observed with GWAC System oleh Hua-Li Li, Jing Wang, Li-Ping Xin, Jian-Ying Bai, Xu-Hui Han, Hong-Bo Cai, Lei Huang, Xiao-Meng Lu, Yu-Lei Qiu, Chao Wu, Guang-Wei Li, Jing-Song Deng, Da-Wei Xu, Yuan-Gui Yang, Xiang-Gao Wang, En-Wei Liang, Jian-Yan Wei