Hélio Mendes de Sousa Mendonça (Author) (FEUP); José Alberto Peixoto Machado da Silva (Author) (FEUP); José Alfredo Ribeiro da Silva Matos (Author) (FEUP)
José Alfredo Ribeiro da Silva Matos (Author) (FEUP); José Alberto Peixoto Machado da Silva (Author) (FEUP); Hélio Mendes de Sousa Mendonca (Author) (FEUP)