Gavlitin, N., V. Messerle, Ustimenko А., and Lavrischev О. “Environmentally Friendly Technology of Pulverized Coal Ash and Slag Removal for Thermal Power Plants”. Recent Contributions to Physics, vol. 2012, no. 2, June 2012, pp. 41-49, https://bph.kaznu.kz/index.php/zhuzhu/article/view/692.