@InProceedings{tu:2016:EMNLP2016,
  author    = {Tu, Kewei},
  title     = {Modified Dirichlet Distribution: Allowing Negative Parameters to Induce Stronger Sparsity},
  booktitle = {Proceedings of the 2016 Conference on Empirical Methods in Natural Language Processing},
  month     = {November},
  year      = {2016},
  address   = {Austin, Texas},
  publisher = {Association for Computational Linguistics},
  pages     = {1986--1991},
  url       = {https://aclweb.org/anthology/D16-1208}
}