Senchenkov, N. P., and K. G. Petrov, “On Patronage and Enlightenment in Russia in the Late ХIХ Century (O.N. Popova’s Activities and Essays)”, Статьи, Pedagogika, 90/5 (2026), 108-15, https://ojs.owebs.ru/pedagogika/article/view/30581, accessed 8 Nov. 2026.