Dependency unification grammar for PROLOG

Login: A logic programming language with built-in inheritance

Journal of Logic Programming

Unification: a multidisciplinary survey

ACM Computing Surveys (CSUR)

Parsing discontinuous constituents in dependency grammar

Computational Linguistics

Extraposition grammars

Computational Linguistics

Dependency Unification Grammar

COLING '86 Proceedings of the 11th coference on Computational linguistics