GRIGONIS, Jonas. V. I. Lenin’s “Materialism and Empiriocriticism” and Natural Sciences. Problemos, [S. l.], v. 3, p. 7–11, 1969. DOI: 10.15388/Problemos.1969.3.5736. Disponível em: https://www.journals.vu.lt/problemos/article/view/5736.. Acesso em: 29 apr. 2024.