@article(2007-efficient-viterbi-algorithms-for-lexical-tree-based-models,
  author = {Salvador España Boquera and María José Castro Bleda and Francisco Julian Zamora Martínez and Jorge Gorbe Moya},
  title = {Efficient Viterbi Algorithms for Lexical Tree Based Models},
  year = {2007},
  journal = {Lecture Notes in Computer Science},
  volume = {4885},
  pages = {179-187}
)