@InProceedings{pighin-moschitti:2009:CoNLL,
  author    = {Pighin, Daniele  and  Moschitti, Alessandro},
  title     = {Efficient Linearization of Tree Kernel Functions},
  booktitle = {Proceedings of the Thirteenth Conference on Computational Natural Language Learning (CoNLL-2009)},
  month     = {June},
  year      = {2009},
  address   = {Boulder, Colorado},
  publisher = {Association for Computational Linguistics},
  pages     = {30--38},
  url       = {http://www.aclweb.org/anthology/W/W09/W09-1106}
}