AIKEN, A.; KOZEN, D.; WIMMERS, E. Decidability of Systems of Set Constraints with Negative Constraints. BRICS Report Series, [S. l.], v. 1, n. 32, 1994. DOI: 10.7146/brics.v1i32.21611. Disponível em: https://tidsskrift.dk/brics/article/view/21611. Acesso em: 27 apr. 2024.