ACETO, L.; FOKKINK, W. J.; VERHOEF, C. Conservative Extension in Structural Operational Semantics. BRICS Report Series, [S. l.], v. 6, n. 24, 1999. DOI: 10.7146/brics.v6i24.20093. Disponível em: https://tidsskrift.dk/brics/article/view/20093. Acesso em: 2 may. 2024.