Further reading Franz Baader and Wayne Snyder (2001). "Unification Theory" . In John Alan Robinson and Andrei Voronkov, editors, Handbook of Automated Reasoning, volume I, pages 447–533. Elsevier Science Publishers. Gilles Dowek (2001). "Higher-order Unification and Matching" . In Handbook of Automated Reasoning. Franz Baader and Tobias Nipkow (1998). Term Rewriting and All That. Cambridge University Press. Franz Baader and (1993). "Unification Theory". In Handbook of Logic in Artificial Intelligence and Logic Programming. Jean-Pierre Jouannaud and Claude Kirchner (1991). "Solving Equations in Abstract Algebras: A Rule-Based Survey of Unification". In Computational Logic: Essays in Honor of Alan Robinson. Nachum Dershowitz and Jean-Pierre Jouannaud, Rewrite Systems, in: Jan van Leeuwen (ed.), Handbook of Theoretical Computer Science, volume B Formal Models and Semantics, Elsevier, 1990, pp. 243–320 Jörg H. Siekmann (1990). "Unification Theory". In Claude Kirchner (editor) Unification. Academic Press. Gérard Huet and Derek C. Oppen (1980). "Equations and Rewrite Rules: A Survey". Technical report. Stanford University. Claude Kirchner and Hélène Kirchner. Rewriting, Solving, Proving''. In preparation.
further reading franz baader and wayne snyder (2001) "unification theory"  in john alan robinson and andrei voronkov editors handbook of automated reasoning volume i pages 447–533 elsevier science publishers gilles dowek (2001) "higher-order unification and matching"  in handbook of automated reasoning franz baader and tobias nipkow (1998) term rewriting and all that cambridge university press franz baader and (1993) "unification theory" in handbook of logic in artificial intelligence and logic programming jean-pierre jouannaud and claude kirchner (1991) "solving equations in abstract algebras a rule-based survey of unification" in computational logic essays in honor of alan robinson nachum dershowitz and jean-pierre jouannaud rewrite systems in jan van leeuwen (ed) handbook of theoretical computer science volume b formal models and semantics elsevier 1990 pp 243–320 jörg h siekmann (1990) "unification theory" in claude kirchner (editor) unification academic press gérard huet and derek c oppen (1980) "equations and rewrite rules a survey" technical report stanford university claude kirchner and hélène kirchner rewriting solving proving'' in preparation