Ronald M. Kaplan and Joan Bresnan. 1982. Lexical-Functional Grammar: A formal system for grammatical representation. In Joan Bresnan (ed),  The Mental Representation of Grammatical Relations,  pp. 173 – 281,  Cambridge:  The MIT Press. Reprinted in Dalrymple,  Kaplan, Maxwell and Zaenen (eds). 1995. Formal Issues in Lexical-Functional Grammar,  pp. 29 – 130,  Stanford:  Center for the Study of Language and Information.