Askarova, A.S., Safarik, Pavel, Bolegenova, S.A., Mazhrenova, N.R., Bolegenova, S.A., AND Nugymanova, A.O.. " Calculation of standards for permissible environmental impact for boilers with known technical characteristics" Recent Contributions to Physics (Rec.Contr.Phys.) [Online], Volume 72 Number 1 (28 March 2020)