1. My collaboration with E. T. Schmidt spanning six decades;Algebra universalis;2018-03
2. Tensor Extensions;The Congruences of a Finite Lattice;2016
3. The mathematics of G. Grätzer and E.T. Schmidt;Algebra universalis;2008-10-11
4. Congruence lattices of function lattices;Order;1994-09
5. Ordered Sets and Duality for Distributive Lattices;Orders: Description and Roles - In Set Theory, Lattices, Ordered Groups, Topology, Theory of Models and Relations, Combinatorics, Effectiveness, Social Sciences, Proceedings of the Conference on Ordered Sets and their Application Château dc la Tourcttc; Ordres: Description et Rôles - En Théorie des Treillis, des Groupes Ordonnés; en Topologie, Théorie des Modèles et des Relations, Cornbinatoire, Effectivité, Sciences Sociales, Actes de la Conférence sur ies Ensembles Ordonnés et leur Applications Château de la Tourette;1984