@inproceedings{borcev-chomjakov-1973-neighbourhood,
    title = "Neighbourhood Description of Formal Languages",
    author = "Borcev, V. B.  and
      Chomjakov, M. V.",
    booktitle = "{COLING} 1973 Volume 1: Computational And Mathematical Linguistics: Proceedings of the International Conference on Computational Linguistics",
    year = "1973",
    url = "https://preview.aclanthology.org/fix-sig-urls/C73-1001/"
}