TY - Front. Comput. Sci. A1 - Gaoqi HE, Qi CHEN, Dongxu JIANG, Yubo YUAN, Xingjian LU T1 - Physical-barrier detection based collective motion analysis Y1 - 2019-04-08 JF - Frontiers of Computer Science JO - Front. Comput. Sci. SP - 426 EP - 436 VL - 13 IS - 2 UR - https://journal.hep.com.cn/fcs N1 - 10.1007/s11704-018-7165-2 ER -