MOSSES, P. D. Foundations of Modular SOS. BRICS Report Series, [S. l.], v. 6, n. 54, 1999. DOI: 10.7146/brics.v6i54.20124. Disponível em: https://tidsskrift.dk/brics/article/view/20124. Acesso em: 20 apr. 2024.