Publication
in: “Proceedings of the 7th World Multiconference on Systemics, Cybernetics and Informatics (SCI 2003)", issued by: Nagib Callaos, William Lesso, Klaus-Dieter Schewe, Elsayed Atlam; International Institute of Informatics and Systemics, 2003, ISBN: 980-6560-01-9, 30 - 36