@article{unsupervisedandefficientvocabulary,
  title = {Unsupervised and Efficient Vocabulary Expansion for Recurrent Neural Network Language Models in ASR},
  author = {Yerbolat Khassanov and Eng Siong Chng},
  year = {2018},
  eprint = {1806.10306},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1806.10306v1},
}