@article{spelloncesummonanywhereatwolevelopen,
  title = {Spell Once, Summon Anywhere: A Two-Level Open-Vocabulary Language Model},
  author = {Sabrina J. Mielke and Jason Eisner},
  year = {2018},
  eprint = {1804.08205},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1804.08205v4},
}