MOSSES, P. D. Unified Algebras and Abstract Syntax. BRICS Report Series, [S. l.], v. 1, n. 5, 1994. DOI: 10.7146/brics.v1i5.21665. Disponível em: https://tidsskrift.dk/brics/article/view/21665. Acesso em: 28 apr. 2024.