@article{JMLR:v15:coviello14a,
  author  = {Emanuele Coviello and Antoni B. Chan and Gert R.G. Lanckriet},
  title   = {Clustering Hidden Markov Models with Variational HEM},
  journal = {Journal of Machine Learning Research},
  year    = {2014},
  volume  = {15},
  number  = {22},
  pages   = {697--747},
  url     = {http://jmlr.org/papers/v15/coviello14a.html}
}