PLEČKAITIS, Romanas. V. I. Lenin’s Logical Ideas and Modern Development of Logic. Problemos, [S. l.], v. 6, p. 20–25, 1970. DOI: 10.15388/Problemos.1970.6.5791. Disponível em: https://www.journals.vu.lt/problemos/article/view/5791. Acesso em: 17 apr. 2025.