Bektenov Nesiphan Abzhaparovich; Murzakassymova Nazgul Sattarkulovna; Gavrilenko Mikhail Alekseevich; Nurlybayeva Аisha Nurlybayevna. PRODUCTION OF SULFOCATIONITE BY MODIFICATION OF NATURAL COAL WITH CONCENTRATED SULFURIC ACID. SCT 2020, 104-109.