@article{Rabiner89_HMM_IEEE,
  title     = {A Tutorial on Hidden {M}arkov Models and Selected Applications in Speech Recognition},
  author    = {Lawrence R. Rabiner},
  journal   = {Proceedings of the IEEE},
  volume    = {77},
  number    = {2},
  pages     = {257--286},
  year      = {1989}
}