@InProceedings{pighin-moschitti:2009:EMNLP,
  author    = {Pighin, Daniele  and  Moschitti, Alessandro},
  title     = {Reverse Engineering of Tree Kernel Feature Spaces},
  booktitle = {Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing},
  month     = {August},
  year      = {2009},
  address   = {Singapore},
  publisher = {Association for Computational Linguistics},
  pages     = {111--120},
  url       = {http://www.aclweb.org/anthology/D/D09/D09-1012}
}