Drăgan, Nicușor. “Considerations on the Nonlinearity Grade of the Nonlinear Mechanical Elastic Systems”. Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XIV, Inginerie mecanică = Annals of “Dunarea de Jos“ University of Galati. Fascicle XIV, Mechanical Engineering 19, no. 1 (June 1, 2012): 13-18. Accessed April 30, 2024. https://www.gup.ugal.ro/ugaljournals/index.php/im/article/view/3680.