Affiliation: | (1) Department of Computer Science and Engineering, Concordia University, Montréal, PQ, H5G 1M8, Canada;(2) Laboratory of Informatics, University of Medicine, Nagyerdei Krt. 98, H-4032 Debrecen, Hungary;(3) Fachbereich 9 Mathematik, Universität des Saarlandes, D-66041 Saarbrücken;, Germany |