URQUHART, Bruce. Extracts System and Management in Swiss Forestry. Indian Forester, [S. l.], v. 75, n. 5, p. 187–190, 1949. DOI: 10.36808/if/1949/v75i5/23100. Disponível em: https://indianforester.co.in/index.php/indianforester/article/view/23100. Acesso em: 20 feb. 2026.