Contribution to the book “Estudos em Honra de João Soares da Silva”

English courtesy translation of the contribution of Francisco Sá Carneiro to the book “Estudos em Honra de João Soares da Silva” (“Papers in Honour of João Soares da Silva”), published in June 2021 by Morais Leitão, Galvão Teles, Soares da Silva & Associados, under the coordination of Carlos Osório de Castro and with preface from António Lobo Xavier.