Affiliation: | (1) School of Information Technology and Engineering, University of Ottawa, 800 King Edward Avenue, Ottawa, Ontario, K1N 6N5, Canada;(2) Faculty of Business, Economics and Statistics, University of Vienna, Bruenner Strasse 72, Vienna, A-1210, Austria;(3) Polish Academy of Sciences, Institute of Computer Science, Ordona 21, 01–237, Warszawa, Poland |