CHOUDHURI, J. C. Basu. A Simple Soil Penetrometer for Biological Work. Indian Forester, [S. l.], v. 87, n. 4, p. 253–256, 1961. DOI: 10.36808/if/1961/v87i4/24531. Disponível em: https://indianforester.co.in/index.php/indianforester/article/view/24531. Acesso em: 10 jul. 2025.