Cautes, Gheorghe. “The Approximate or Exact Analytical Solutions for the Differential Equations Which Describe Parametric Free Vibrations of Mechanical Systems”. Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XIV, Inginerie mecanică = Annals of “Dunarea de Jos“ University of Galati. Fascicle XIV, Mechanical Engineering 20, no. 1 (June 5, 2013): 65-68. Accessed May 5, 2024. https://www.gup.ugal.ro/ugaljournals/index.php/im/article/view/3556.