ANDERSEN, Dan S.; PEDERSEN, Lars H.; HÜTTEL, Hans; KLEIST, Josva. Objects, Types and Modal Logics. BRICS Report Series, [S. l.], v. 3, n. 49, 1996. DOI: 10.7146/brics.v3i49.20051. Disponível em: https://tidsskrift.dk/brics/article/view/20051. Acesso em: 6 dec. 2025.