CHUTIBUT, W.; WONGTREE, J.; PIMPET, T.; KHONGNAM, C.; HANJAVANICH, O. Proficiency Testing in Chemical  Fertilizer Analysis . Thai Agricultural Research Journal, [S. l.], v. 27, n. 1, p. 43, 2009. DOI: 10.14456/thaidoa-agres.2009.3. Disponível em: https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/91674. Acesso em: 1 oct. 2026.