@inproceedings{sogaard-2009-complexity,
    title = "On the Complexity of Alignment Problems in Two Synchronous Grammar Formalisms",
    author = "S{\o}gaard, Anders",
    editor = "Wu, Dekai  and
      Chiang, David",
    booktitle = "Proceedings of the Third Workshop on Syntax and Structure in Statistical Translation ({SSST}-3) at {NAACL} {HLT} 2009",
    month = jun,
    year = "2009",
    address = "Boulder, Colorado",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/W09-2308/",
    pages = "60--68"
}