Constraints on Variables in Syntax. Ross, J. R. Ph.D. Thesis, MIT, Cambridge, MA, 1967.
bibtex   
@phdthesis{ross_constraints_1967,
	address = {Cambridge, MA},
	type = {{PhD} dissertation},
	title = {Constraints on {Variables} in {Syntax}},
	school = {MIT},
	author = {Ross, John Robert},
	year = {1967},
	keywords = {Try and},
}

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