SINGH, S. P. Second Tree Diameter and Tree Volume Estimation. Indian Forester, [S. l.], v. 107, n. 7, p. 412–415, 1981. DOI: 10.36808/if/1981/v107i7/11043. Disponível em: http://indianforester.co.in/index.php/indianforester/article/view/11043. Acesso em: 4 dec. 2025.