@Book{CONLL:2008,
  editor    = {Alexander Clark  and  Kristina Toutanova},
  title     = {CoNLL 2008: Proceedings of the Twelfth Conference on Computational Natural Language Learning},
  month     = {August},
  year      = {2008},
  address   = {Manchester, England},
  publisher = {Coling 2008 Organizing Committee},
  url       = {http://www.aclweb.org/anthology/W08-21}
}