@InProceedings{maas-EtAl:2015:NAACL-HLT,
    author    = {Maas, Andrew  and  Xie, Ziang  and  Jurafsky, Dan  and  Ng, Andrew},
    title     = {Lexicon-Free Conversational Speech Recognition with Neural Networks},
    booktitle = {Proceedings of the 2015 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies},
    year      = {2015},
    address   = {Denver, Colorado},
    publisher = {ACL}
    pages     = {345--354},
    url       = {http://www.aclweb.org/anthology/N15-1038}
}