CERTIFICATE Hereby SOBRAPO and ALIO certifies that Everton da Silva Farias attended the XVI Latin-Ibero-American Conference on Operations Research and XLIV Brazilian Symposium on Operations Research, held in Rio de Janeiro (RJ), Brazil, September 24th to 28th, 2012, with the poster "Configuração da Rede de Distribuição de Jornais: Um Modelo a partir da Pesquisa Operacional". Co-authored with: Denise Lindstrom Bandeira