@inproceedings{decouplingsparsityandsmoothnessinthe,
  title = {Decoupling Sparsity and Smoothness in the Discrete Hierarchical Dirichlet Process},
  author = {Chong Wang and David M. Blei},
  year = {2009},
  booktitle = {NeurIPS 2009 12},
  url = {http://papers.nips.cc/paper/3835-decoupling-sparsity-and-smoothness-in-the-discrete-hierarchical-dirichlet-process},
}