@InProceedings{marquez-EtAl:2007:SemEval-20072,
  author    = {M\`{a}rquez, Llu\'{i}s  and  Padr\'{o}, Llu\'{i}s  and  Surdeanu, Mihai  and  Villarejo, Luis},
  title     = {UPC: Experiments with Joint Learning within SemEval Task 9},
  booktitle = {Proceedings of the Fourth International Workshop on Semantic Evaluations (SemEval-2007)},
  month     = {June},
  year      = {2007},
  address   = {Prague, Czech Republic},
  publisher = {Association for Computational Linguistics},
  pages     = {426--429},
  url       = {http://www.aclweb.org/anthology/S/S07/S07-1095}
}