V. Geanta, I. Voiculescu, R. Stefanoiu, D. Savastru, D. Daisa, Effect of thermal regime on the microstructure and microhardness of steels microalloyed with Nb and V, J. OPTOELECTRON ADV MAT, vol. 15, no. 11, pp. 1457-1462, 1454-4164, 2013