The dynamic analysis of the inertial vibrating screens modeled as 3DOF elastic systems - Drăgan, Nicușor (Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XIV, Inginerie mecanică = Annals of “Dunarea de Jos“ University of Galati. Fascicle XIV, Mechanical Engineering, 2012)