A. PETROVA, S. SIMEONOVA, R. VALOV, and V. PETKOV, “PhysicoMechanical and Physico-Chemical Properties of Bio-Inert Composite Ceramics”, The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science, vol. 33, no. 4, pp. 51-55, Dec. 2010.