Lexicon-Free Conversational Speech Recognition with Neural Networks Andrew Maas author Ziang Xie author Dan Jurafsky author Andrew Ng author 2015-may–jun text Proceedings of the 2015 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies Rada Mihalcea editor Joyce Chai editor Anoop Sarkar editor Association for Computational Linguistics Denver, Colorado conference publication maas-etal-2015-lexicon 10.3115/v1/N15-1038 https://aclanthology.org/N15-1038/ 2015-may–jun 345 354