WUTTICH, K. Are the future and the past really opacity-creating operators?. Logic and Logical Philosophy, [S. l.], n. 3, p. 185–193, 2003. DOI: 10.12775/LLP.1995.011. Disponível em: https://apcz.umk.pl/LLP/article/view/LLP.1995.011. Acesso em: 25 apr. 2024.