A. Leopa und S. Nastac, Influence of the behavior of nonlinear viscoelastic systems bearing on the dynamics of bridge structures, 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. 51-56, Juni 2011.