The convergence of mildly context-sensitive grammar formalisms. Joshi, A. K., Shanker, K. V., & Weir, D. J. In Sells, P., Shieber, S. M., & Wasow, T., editors, Foundational Issues in Natural Language Processing, pages 31–81. MIT Press, Cambridge, MA, 1991.
bibtex   
@incollection{joshi_convergence_1991,
	address = {Cambridge, MA},
	title = {The convergence of mildly context-sensitive grammar formalisms},
	booktitle = {Foundational {Issues} in {Natural} {Language} {Processing}},
	publisher = {MIT Press},
	author = {Joshi, Aravind K. and Shanker, K. Vijay and Weir, David Jeremy},
	editor = {Sells, P. and Shieber, Stuart M. and Wasow, Thomas},
	year = {1991},
	pages = {31--81}
}

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