Aikozova Laura Dauletbekovna; Tukibayeva Ainur Sultankhanovna; Bayeshov Abduali; Leska Boguslawa; Baiysbai Omirbek Pernebaiuly. STUDYING THE PROCESS OF OBTAINING PHOSPHATES OF METALS BASED ON THE PHASE EQUILIBRIA OF FOUR COMPONENT SYSTEMS. SCT 2019, 39-46.