Yermagambet Bolat Toleukhanuly, Kazankapova Maira Kuttybaevna, Kassenova Zhanar Muratbekovna, и Nauryzbaeva Asemay Turlangyzy. 2020. «OBTAINING DERIVATIVES OF HUMIC SUBSTANCES FROM OXIDIZED COAL AND STUDY OF PHYSICO-CHEMICAL AND ADSORPTION PROPERTIES». Известия НАН РК. Серия химии и технологии, вып. 6 (декабрь):57-64. http://189185.vm7pq.group/chemistry-technology/article/view/566.