PALSBERG, J.; SCHWARTZBACH, M. I. A Unified Type System for Object-Oriented Programming. DAIMI Report Series, [S. l.], v. 19, n. 341, 1990. DOI: 10.7146/dpb.v19i341.6571. Disponível em: https://tidsskrift.dk/daimipb/article/view/6571. Acesso em: 9 may. 2024.