PEZLAR, I. Algorithmic Theories of Problems. A Constructive and a Non-Constructive Approach. Logic and Logical Philosophy, [S. l.], v. 26, n. 4, p. 473–508, 2017. DOI: 10.12775/LLP.2017.010. Disponível em: https://apcz.umk.pl/LLP/article/view/LLP.2017.010. Acesso em: 27 apr. 2024.