Pereira, Fernando C. N.; Warren, David H. D. (1983). "Parsing as deduction". Proceedings of the 21st annual meeting on Association for Computational Linguistics -. Morristown, NJ, USA: Association for Computational Linguistics. doi:10.3115/981311.981338.
Pereira, Fernando C. N.; Warren, David H. D. (1983). "Parsing as deduction". Proceedings of the 21st annual meeting on Association for Computational Linguistics -. Morristown, NJ, USA: Association for Computational Linguistics. doi:10.3115/981311.981338.