BROADFOOT, K. SEED CERTIFICATION. NZGA: Research and Practice Series, [S. l.], v. 5, p. 32–34, 1990. DOI: 10.33584/rps.5.1998.3333. Disponível em: https://www.nzgajournal.org.nz/index.php/rps/article/view/3333. Acesso em: 16 jun. 2026.