@inproceedings{PhanEtal14,
  author    = {NhatHai Phan and Dejing Dou and Xiao Xiao and Brigitte Piniewski and David Kil},
  title     = {{Analysis of Physical Activity Propagation in a Health Social Network}},
  booktitle = {Proceedings of the 23rd ACM Conference on Information and Knowledge Management (CIKM)},
  pages     = {1329-1338},
  year      = {2014},
}