SINGH, Virendra. Seed Maturity Indices in Spruce. Indian Forester, [S. l.], v. 115, n. 5, p. 342–347, 1989. DOI: 10.36808/if/1989/v115i5/9047. Disponível em: https://indianforester.co.in/index.php/indianforester/article/view/9047. Acesso em: 10 jul. 2025.