Ермагамбет , Болат, Maira Kazankapova, и Жанар Касенова. «OBTAINING COMPOSITE MATERIAL BASED ON HUMIC ACID AND MICROSPHERE AND APPLICATION FOR WATER TREATMENT FROM HEAVY METALS». Academic Scientific Journal of Chemistry, no. 3 (сентябрь 30, 2022): 86–96. просмотрено декабрь 5, 2025. https://journals.nauka-nanrk.kz/chemistry-technology/article/view/3193.