A Study Of Major And Trace Element Accumulation In Humic Acids. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, [S. l.], v. 1, p. 76–82, 2015. DOI: 10.17770/etr2011vol1.891. Disponível em: https://archive-journals.rtu.lv/etr/article/view/3768.. Acesso em: 11 mar. 2026.