@Book{CoNLL-ST:2011,
  editor    = {Sameer Pradhan, BBN Technologies},
  title     = {Proceedings of the Fifteenth Conference on Computational Natural Language Learning: Shared Task},
  month     = {June},
  year      = {2011},
  address   = {Portland, Oregon, USA},
  publisher = {Association for Computational Linguistics},
  url       = {http://www.aclweb.org/anthology/W11-19}
}