First Author:   Pedro Hemsley UFRJ pedro.hemsley@ie.ufrj.br   Avenida Pasteur, 250, Sala 108 Rio de Janeiro, 22.290-240, Brazil   +5521981198363(Phone) +5521981198363(Fax) www.pedrohemsley.com Second Author: Lynda Pavão State University of Rio de Janeiro lynda.pavao@gmail.com