Risteska, Aleksandra, and Vlado Gicev. “DEPENDENCE OF INPUT ENERGY FROM THE LEVEL OF GROUND NONLINEARITY ”. Balkan Journal of Applied Mathematics and Informatics 5, no. 1 (June 21, 2022): 7-18. Accessed April 3, 2025. https://js.ugd.edu.mk/index.php/bjami/article/view/4953.