@InProceedings{Liang-Petrov-Jordan-Klein:2007:InfinitePCFG,
  title     = {The Infinite {PCFG} using Hierarchical {Dirichlet} Processes},
  author    = {Percy Liang and Slav Petrov and Michael Jordan and Dan Klein},
  booktitle = {Proceedings of EMNLP},
  year      = {2007},
  pages     = {688--697},
  url       = {http://www.aclweb.org/anthology/D/D07/D07-1072},
}