“Use of Taguchi Methods for Hierarchy of Influence Factors in the Application of Carbonitration in a Fluidized Bed Steel for 41Cr4 Steel”. The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science, vol. 44, no. 3, Sept. 2021, pp. 36-47, https://doi.org/10.35219/mms.2021.3.07.