Fedoryshyn, Roman     Automation and optimization of coal grinding by means of ball mills [Текст] / Roman Fedoryshyn, Volodymyr Zagraj, Yevhen. Pistun // Annals of DAAM for 2011 and proceedings of the 22nd International DAAM symposium "Intelligent manufacturing and automation: power of knowledge and creativity", 23-26 Nov. 2011, Vienna, Austria / Danube adria association for automation and manufacturing etc. ; ed. : B. Katalinic. — Vienna, 2011. — P. 421-422.