@inproceedings{factorialldasparsemultidimensionaltext,
  title = {Factorial LDA: Sparse Multi-Dimensional Text Models},
  author = {Michael Paul and Mark Dredze},
  year = {2012},
  booktitle = {NeurIPS 2012 12},
  url = {http://papers.nips.cc/paper/4784-factorial-lda-sparse-multi-dimensional-text-models},
}