If you use any of these parsers, please cite the following papers:

Vilares, D., Alonso, M. A., & Gómez-Rodríguez, C. (2015). One model, two languages: training bilingual parsers with harmonized treebanks. arXiv preprint arXiv:1507.08449.

@article{vilares2015one,
  title={One model, two languages: training bilingual parsers with harmonized treebanks},
  author={Vilares, David and Alonso, Miguel A and G{\'o}mez-Rodr{\'\i}guez, Carlos},
  journal={arXiv preprint arXiv:1507.08449},
  year={2015}
}

Nivre, J., Hall, J., Nilsson, J., Chanev, A., Eryigit, G., Kübler, S., ... & Marsi, E. (2007). MaltParser: A language-independent system for data-driven dependency parsing. Natural Language Engineering, 13(02), 95-135.

@article{nivre2007maltparser,
  title={MaltParser: A language-independent system for data-driven dependency parsing},
  author={Nivre, Joakim and Hall, Johan and Nilsson, Jens and Chanev, Atanas and Eryigit, G{\"u}lsen and K{\"u}bler, Sandra and Marinov, Svetoslav and Marsi, Erwin},
  journal={Natural Language Engineering},
  volume={13},
  number={02},
  pages={95--135},
  year={2007},
  publisher={Cambridge Univ Press}
}


Ballesteros, M., & Nivre, J. (2012, April). MaltOptimizer: an optimization tool for MaltParser. In Proceedings of the Demonstrations at the 13th Conference of the European Chapter of the Association for Computational Linguistics (pp. 58-62). Association for Computational Linguistics.

@inproceedings{ballesteros2012maltoptimizer,
  title={MaltOptimizer: an optimization tool for MaltParser},
  author={Ballesteros, Miguel and Nivre, Joakim},
  booktitle={Proceedings of the Demonstrations at the 13th Conference of the European Chapter of the Association for Computational Linguistics},
  pages={58--62},
  year={2012},
  organization={Association for Computational Linguistics}
}