VALEVIČIUS, V. From the History of Logic. Problemos, [S. l.], v. 26, p. 122–122, 1981. DOI: 10.15388/Problemos.1981.26.6301. Disponível em: https://test.zurnalai.vu.lt/problemos/article/view/6301. Acesso em: 28 oct. 2025.