1. Polynomial functions on subdirect products;Monatshefte für Mathematik;2009-05-26
2. The algebra of metric betweenness I: Subdirect representation and retraction;European Journal of Combinatorics;2007-08
3. Diagonal subalgebras and local polynomial functions of median algebras;Algebra Universalis;1993-03
4. Strictly locally order affine complete lattices;Order;1993
5. Compatible Orderings and Toleranges of 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