Totev, Totyo, and Dinko Kanev. 2014. “Comparative Analysis of Firing Different Coal Blends for Boiler 12 at TPP”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 14 (1):340-53. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/1856.