@article{BalGomNivSEPLN2012,
  title={Optimizing {Planar} and {2-Planar} Parsers with {MaltOptimizer}},
  author={Miguel Ballesteros and Carlos G{\'o}mez-Rodr\'{\i}guez and Joakim Nivre},
  journal={Procesamiento del Lenguaje Natural},
  issn={1135-5948},
  volume={49},
  pages={171--178},
  year={2012}
}