BÁCS, Zoltán György. NAUM EITINGON AND THE ACTIVITY OF THE SOVIET SECRET SERVICES IN SPAIN AND MEXICO IN THE FIRST HALF OF THE TWENTIETH CENTURY. POLARITIES, [S. l.], v. 4, n. 2, p. 38–55, 2023. DOI: 10.15170/PSK.2023.04.02.03. Disponível em: https://journals.lib.pte.hu/index.php/polusok/article/view/6303. Acesso em: 14 mar. 2025.