V. B. Borcev, M. V. Chomjakov. Neighbourhood Description of Formal Languages. In Antonio Zampolli, Nicoletta Calzolari, editors, Computational And Mathematical Linguistics: Proceedings of the 5th International Conference on Computational Linguistics, COLING 1973, Pisa, Italy, August 27 - September 1, 1973. pages 3-8, ACL, 1973. [doi]
Abstract is missing.