@InProceedings{auli-EtAl:2009:WMT,
  author    = {Auli, Michael  and  Lopez, Adam  and  Hoang, Hieu  and  Koehn, Philipp},
  title     = {A Systematic Analysis of Translation Model Search Spaces},
  booktitle = {Proceedings of the Fourth Workshop on Statistical Machine Translation},
  month     = {March},
  year      = {2009},
  address   = {Athens, Greece},
  publisher = {Association for Computational Linguistics},
  pages     = {224--232},
  url       = {http://www.aclweb.org/anthology/W09-0437}
}