Ganiev Pirnazar, Namazov Shafoat, Usanboyev Najimuddin,. 2020. “Humic Superphosphates Based On Phosphorites And Oxidized Local Coal”. International Journal of Advanced Science and Technology 29 (9s), 2042 -52. http://sersc.org/journals/index.php/IJAST/article/view/14498.