@article(2002-shallow-parsing-using-specialized-hmm,
  author = {Antonio Molina Marco and Ferran Pla Santamaría},
  title = {Shallow Parsing using Specialized HMM},
  year = {2002},
  journal = {Journal of Machine Learning Research (JMLR)},
  volume = {2},
  pages = {595-613}
)