To cite use:

Matt Taddy (AISTATS 2012) On Estimation of Topic Models, http://jmlr.csail.mit.edu/proceedings/papers/v22/taddy12/taddy12.pdf

Corresponding BibTeX entry:

  @InProceedings{,
    title = {On Estimation for Topic Models},
    author = {Matt Taddy},
    year = {2012},
    booktitle = {AISTATS},
    note =
      {http://jmlr.csail.mit.edu/proceedings/papers/v22/taddy12/taddy12.pdf},
  }