@article{groupeventdetectionwithavaryingnumber,
  title = {Group Event Detection with a Varying Number of Group Members for Video Surveillance},
  author = {Weiyao Lin and Ming-Ting Sun and Radha Poovendran and Zhengyou Zhang},
  year = {2015},
  eprint = {1503.00082},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1503.00082v1},
}