2011, Part of book or chapter of book (Igelnik, B. (ed.), Computational Modeling and Simulation of Intellect: Current State and Future Perspectives, pp. 321-341)
2002, Part of book or chapter of book (Priss, U. (ed.), Conceptual Structures: Integration and Interfaces: 10th International Conference on Conceptual Structures, ICCS 2002 Borovets, Bulgaria, July 15–19, 2002 Proceedings, pp. 177-190)
2002, Part of book or chapter of book (Priss, U. (ed.), Conceptual Structures: Integration and Interfaces: 10th International Conference on Conceptual Structures, ICCS 2002 Borovets, Bulgaria, July 15–19, 2002. Proceedings, pp. 20-33)