N. Drăgan, “Dynamic analisys of the parameters of the mechanical systems with structural damping. Viscoelastic sls model. Part 1: amplitude factor”, Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XIV, Inginerie mecanică = Annals of “Dunarea de Jos“ University of Galati. Fascicle XIV, Mechanical Engineering, vol. 23, no. 2, pp. 9-12, Nov. 2016.