“Considerations on the nonlinearity grade of the nonlinear mechanical elastic systems” (2012) Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XIV, Inginerie mecanică = Annals of “Dunarea de Jos“ University of Galati. Fascicle XIV, Mechanical Engineering, 19(1), pp. 13–18. Available at: https://ojs.ugal.ro/index.php/im/article/view/3680 (Accessed: 2 November 2026).