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Vijay-Shanker, K., Weir, David and Joshi, Aravind (1987) Characterizing structural descriptions produced by various grammatical formalisms. In: Proceedings of the 25th Meeting of the Association for Computational Linguistics. Association for Computational Linguistics, Stanford, California, pp. 104-111.

Vijay-Shanker, K., Weir, David and Joshi, Aravind (1987) On the progression from context-free to tree adjoining languages. In: Manaster-Ramer, A. (ed.) Mathematics of Language. John Benjamins, Amsterdam, pp. 389-401. ISBN 1556190328