XI Sigma PI. Indian Forester, [S. l.], v. 66, n. 5, p. 286–287, 1940. DOI: 10.36808/if/1940/v66i5/21560. Disponível em: https://indianforester.co.in/index.php/indianforester/article/view/21560. Acesso em: 27 dec. 2025.