Danev, P.,
Totev, T., &
Bonev, B.
(2001).
Study of the Strukture of Slag, Precipitatea on the Heating Surfaces in the Furnace Camera of Energy Boilers Burning out Low-Guality Brown Coal. // <I>Procееdings<D> of the 10th Jubilee International Scientific Conference Achievements in in Mechanical & Materials Engineering, Gliwice - Cracow - Zakopane, Poland, 9-13 December, 2001.- Gliwice : Silesian Univ. of Technology, 2001, p. 111-114..