PALSBERG, J.; SCHWARTZBACH, M. I. Type substitution for object-oriented programming. DAIMI Report Series, [S. l.], v. 19, n. 317, 1990. DOI: 10.7146/dpb.v19i317.6707. Disponível em: https://tidsskrift.dk/daimipb/article/view/6707. Acesso em: 9 may. 2024.