@misc{W2134237567,
  author = {Slava M. Katz},
  title = {Estimation of probabilities from sparse data for the language model component of a speech recognizer},
  year = {1987},
  howpublished = {IEEE Transactions on Acoustics Speech and Signal Processing},
  doi = {https://doi.org/10.1109/tassp.1987.1165125}
}