FineST98'

@article{DBLP:journals/ml/FineST98,
  author    = {Shai Fine and
               Yoram Singer and
               Naftali Tishby},
  title     = {The Hierarchical Hidden Markov Model: Analysis and Applications},
  journal   = {Machine Learning},
  volume    = {32},
  number    = {1},
  year      = {1998},
  pages     = {41-62},
  ee        = {http://dx.doi.org/10.1023/A:1007469218079},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}