GRELL, K. G. Die russische Steppenpest. ERDKUNDE, [S. l.], v. 2, n. 2, p. 230–237, 1948. DOI: 10.3112/erdkunde.1948.02.05. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/892. Acesso em: 4 dec. 2024.