@inproceedings{aseparatelypassiveaggressivetraining,
  title = {A Separately Passive-Aggressive Training Algorithm for Joint POS Tagging and Dependency Parsing},
  author = {Zhenghua Li and Min Zhang and Wanxiang Che and Ting Liu},
  year = {2012},
  booktitle = {COLING 2012 12},
  url = {https://aclanthology.org/C12-1103},
}