N. Drăgan, Modal damping ratio calculation for finited of mechanical systems with viscous elastic bearings using virtual instrumentation, Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XIV, Inginerie mecanică = Annals of “Dunarea de Jos“ University of Galati. Fascicle XIV, Mechanical Engineering, Bd. 18, Nr. 1, S. 17-22, Juni 2011.