Minghua Li, Liming Chen, Dazhang Li, Kai Huang, Yifei Li, Yong Ma, Wenchao Yan, Mengze Tao, Junhao Tan, Zhengming Sheng, Jie Zhang. Collimated gamma rays from laser wakefield accelerated electrons[J]. Matter and Radiation at Extremes, 2018, 3(4): 188