@article(2001-language-understanding-using-two-level-stochastic-models-with-pos-and-semantic-units,
  author = {Ferran Pla Santamaría and Antonio Molina Marco and Emilio Sanchis Arnal and Encarna Segarra Soriano and Fernando García Granada},
  title = {Language Understanding using Two-level Stochastic Models with POS and Semantic Units},
  year = {2001},
  journal = {Lecture Notes in Computer Science},
  pages = {403-409}
)