@InProceedings{downey-bhagavatula-yang:2015:ACL-IJCNLP,
  author    = {Downey, Doug  and  Bhagavatula, Chandra  and  Yang, Yi},
  title     = {Efficient Methods for Inferring Large Sparse Topic Hierarchies},
  booktitle = {Proceedings of the 53rd Annual Meeting of the Association for Computational Linguistics and the 7th International Joint Conference on Natural Language Processing (Volume 1: Long Papers)},
  month     = {July},
  year      = {2015},
  address   = {Beijing, China},
  publisher = {Association for Computational Linguistics},
  pages     = {774--784},
  url       = {http://www.aclweb.org/anthology/P15-1075}
}