@proceedings {citation222,
	title = {The infinite PCFG using Hierarchical Dirichlet Processes},
	journal = {Empirical Methods in Natural Language Processing},
	year = {2007},
	month = {2007},
	url = {http://www.cs.berkeley.edu/~jordan/papers/hdppcfg-emnlp2007.pdf},
	author = {Percy Liang and Slav Petrov and Michael I. Jordan and Dan Klein}
}
