DUDARE, Diana; PURMALIS, Oskars; KLAVINS, Maris. A Study Of Major And Trace Element Accumulation In Humic Acids. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 76–82, 2015. DOI: 10.17770/etr2011vol1.891. Disponível em: https://journals.ru.lv/index.php/ETR/article/view/891.. Acesso em: 27 apr. 2024.