Foundations of Information Technology in the Era of Network and Mobile Computing : IFIP 17th World Computer Congress . TC1 Stream / 2nd IFIP International Conference on Theoretical Computer Science (TCS 2002) August 25.30, 2002, Montréal, Québec, Canada - Ricardo Baeza-Yates, Ugo Montanari, Nicola Santoro ((IFIP Advances in Information and Communication Technology))