S. CONSTANTINESCU, M. VLAD, and T. RADU, “Characterisation of CVD Niobium Carbide Coatings on Hard Carbide Substrate”, The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science, vol. 35, no. 1, pp. 51-55, Mar. 2012.