@proceedings {citation221,
	title = {Hierarchical beta processes and the Indian buffet process},
	journal = {Artificial Intelligence and Statistics (AISTATS)},
	year = {2007},
	month = {2007},
	url = {http://www.cs.berkeley.edu/~jordan/papers/thibaux-jordan-aistats07.pdf},
	author = {R. Thibaux and M. I. Jordan}
}
