@Book{WMT:2009,
  editor    = {Chris Callison-Burch  and  Philipp Koehn  and  Christof Monz  and  Josh Schroeder},
  title     = {Proceedings of the Fourth Workshop on Statistical Machine Translation},
  month     = {March},
  year      = {2009},
  address   = {Athens, Greece},
  publisher = {Association for Computational Linguistics},
  url       = {http://www.aclweb.org/anthology/W09-04}
}