CAZACU, N.; DOBROVICI, S.; BÂCLEA, A.; TĂNĂSESCU, V.; PREDA, N. Oxidizing Influence over Surface Structures and Properties for A3k Steel Nitrocarburized in Fluidized Bed. The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science 2006, 29, 7-11.