@article{reducedrankhiddenmarkovmodels,
  title = {Reduced-Rank Hidden Markov Models},
  author = {Sajid M. Siddiqi and Byron Boots and Geoffrey J. Gordon},
  year = {2009},
  eprint = {0910.0902},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/0910.0902v3},
}