SHEVCHUK, T. Ukrainian Intelligence in 1917-1921: Formation of Civil Position. Problems of World History, [S. l.], n. 17, p. 98–109, 2025. DOI: 10.46869/2707-6776-2022-17-4. Disponível em: https://journal.ivinas.gov.ua/pwh/article/view/359. Acesso em: 4 jun. 2026.