Zhang D, Zhang Z. Sign-changing Solutions for Fourth Order Elliptic Equation with Concave-convex Nonlinearities. J. Adv. Appl. Computat. Math. [Internet]. 2024 Jul. 8 [cited 2025 Jul. 13];11:1-16. Available from: https://ijaet-journal.org/index.php/jaacm/article/view/1520