VALEVIČIUS, V. Iš logikos istorijos. Problemos, [S. l.], v. 26, p. 122–122, 1981. DOI: 10.15388/Problemos.1981.26.6301. Disponível em: https://www.zurnalai.vu.lt/problemos/article/view/6301.. Acesso em: 16 may. 2024.