TROLL, C. Leninistische Geographie?. ERDKUNDE, [S. l.], v. 11, n. 3, p. 235–235, 1957. DOI: 10.3112/erdkunde.1957.03.08. Disponível em: https://www.erdkunde.uni-bonn.de/article/view/1213. Acesso em: 28 may. 2025.