@article{JMLR:v14:johnson13a,
  author  = {Matthew J. Johnson and Alan S. Willsky},
  title   = {Bayesian Nonparametric Hidden Semi-Markov Models},
  journal = {Journal of Machine Learning Research},
  year    = {2013},
  volume  = {14},
  number  = {20},
  pages   = {673--701},
  url     = {http://jmlr.org/papers/v14/johnson13a.html}
}