KACZMAREK, Janusz. Three aspects of decidability. Acta Universitatis Lodziensis. Folia Philosophica. Ethica-Aesthetica-Practica, Poland, n. 7, p. 65–73, 1990. DOI: 10.18778/0208-6107.07.05. Disponível em: https://czasopisma.uni.lodz.pl/philosophica/article/view/17649. Acesso em: 30 may. 2026.