KASSIMOVA, S.S. The last years of life of Saken Seifullin. Bulletin of the Karaganda university History. Philosophy series, [S. l.], v. 94, n. 2, p. 50–57, 2019. Disponível em: https://history-philosophy-vestnik.buketov.edu.kz/history-philosophy-vestnik/article/view/333. Acesso em: 20 sep. 2026.