„The approximate or exact analytical solutions for the differential equations which describe parametric free vibrations of mechanical systems“, ANN_UDJG_IM, Bd. 20, Nr. 1, S. 65–68, Juni 2013, Zugegriffen: Nov. 02, 2026. Verfügbar unter: https://ojs.ugal.ro/index.php/im/article/view/3556