@InProceedings{yan-EtAl:2015:ACL-IJCNLP,
  author    = {Yan, Rui  and  Li, Xiang  and  Liu, Mengwen  and  Hu, Xiaohua},
  title     = {Tackling Sparsity, the Achilles Heel of Social Networks: Language Model Smoothing via Social Regularization},
  booktitle = {Proceedings of the 53rd Annual Meeting of the Association for Computational Linguistics and the 7th International Joint Conference on Natural Language Processing (Volume 2: Short Papers)},
  month     = {July},
  year      = {2015},
  address   = {Beijing, China},
  publisher = {Association for Computational Linguistics},
  pages     = {623--629},
  url       = {http://www.aclweb.org/anthology/P15-2103}
}