@inproceedings{PZ15a,
  author        = {J. Pang and Y. Zhang},
  title         = {Exploring communities for effective location prediction},
  booktitle     = {Proc.\ 24th World Wide Web Conference (Companion Volume) (WWW'15)},
  publisher     = {ACM Press},
  year          = {2015},
  pages         = {87-88}
}