SARAN, Alexander Yurievich. Elimination of Districts in 1930 and Crisis of Mega-areas (on the Example of Central Black Earth Region). Administrative Consulting, [S. l.], n. 10, p. 208–218, 2016. Disponível em: https://administrative-consulting.owebs.ru/article/view/13203. Acesso em: 8 nov. 2026.