What Is Essential Unification?

Peter Szabó, Jörg H. Siekmann, Michael Hoche. What Is Essential Unification?. In Eugenio G. Omodeo, Alberto Policriti, editors, Martin Davis on Computability, Computational Logic, and Mathematical Foundations. Volume 10 of Outstanding Contributions to Logic, pages 285-314, Springer, 2016. [doi]