T. Schlemmer, and S. Schmidt. Proceedings of the Sixth International Conference on Concept Lattices and Their Applications (CLA2008), volume 433 of CEUR Workshop Proceedings, page 9--22. Aachen, Sun SITE Central Europe, (January 2009)
T. Schlemmer, and S. Schmidt. Proceedings of the Sixth International Conference on Concept Lattices and Their Applications, page 9--22. Olomouc, Czech Republic, Palacký University, (Oktober 2008)