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 Apr. 28];11:1-16. Available from: https://avantipublishers.com/index.php/jaacm/article/view/1520