| Affiliation: | 1. School of Informatics, University of Edinburgh, Edinburgh EH9 3JZ, Scotland, UK;2. Department of Computer and Information Science, University of Pennsylvania, 3330 Walnut Street, Philadelphia, PA 19104-6389, USA;3. Bell Laboratories, 600 Mountain Ave., Murray Hill, NJ 07974-0636, USA;4. Departamento de Informatica, Universidade Federal do Parana, Centro Politecnico, Curitiba, PR 81531-990, Brazil;5. Department of Computer Science, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA;1. Department de Engenharia Elétrica, Universidade Federal da Paraı́ba C.P.10053, Campina Grande PB, Brazil;2. Dipartimento di Informatica e Sistemı́stica, Università di Roma “La Sapienza” I-00198, Rome, Italy;3. Department de Sistemas e Computação, Universidade Federal da Paraı́ba, Av. Aprigo Veloso s/n-C.P.10106, Campina Grande PB, 58109-970, Brazil |
