AfrouziG. A., ShakeriS., and ZahmatkeshH. “Existence Results for a Class of Kirchhoff-type systems With Combined Nonlinear Effects”. Ukrains’kyi Matematychnyi Zhurnal 71, no. 4 (April 25, 2019): 571-580. Accessed November 21, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1458.