ROBBINS, C. R. The Swing of the Pendulam. Indian Forester, [S. l.], v. 47, n. 11, p. 444–452, 1921. DOI: 10.36808/if/1921/v47i11/18441. Disponível em: http://indianforester.co.in/index.php/indianforester/article/view/18441. Acesso em: 5 dec. 2025.