@Book{TextGraphs4:2009,
  editor    = {Monojit Choudhury  and  Samer Hassan  and  Animesh Mukherjee  and  Smaranda Muresan},
  title     = {Proceedings of the 2009 Workshop on Graph-based Methods for Natural Language Processing (TextGraphs-4)},
  month     = {August},
  year      = {2009},
  address   = {Suntec, Singapore},
  publisher = {Association for Computational Linguistics},
  url       = {http://www.aclweb.org/anthology/W/W09/W09-32}
}