Ivo Düntsch Ewa Orlowska Anna Maria Radzikowska Lattice-Based Relation Algebras II. 267-289 2006 conf/RelMiCS/2006tarski Theory and Applications of Relational Structures as Knowledge Instruments http://dx.doi.org/10.1007/11964810_13 db/conf/RelMiCS/tarski2006.html#DuntschOR06