Properties of Slags in the System CaO-MgO-Al2O3-SiO2, Important in Deoxidization and Desulphurization of Low Carbon Aluminium Killed Steels - NITA, Petre Stelian (The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science, 2012)