JOMHATAIKOOL, B.; FAUNGNAWAKIJ, K.; KUBOON, S.; KRAITHONG, W.; CHUTIPAICHIT, S.; FUJI, M.; EIAD-UA, A. Effect of humic acid extracted from Thailand’s leonardite on rice growth. Journal of Metals, Materials and Minerals, Bangkok, Thailand, v. 29, n. 1, 2019. Disponível em: http://jmmm.material.chula.ac.th/index.php/jmmm/article/view/400. Acesso em: 2 dec. 2021.