Mohammed M. Matar, Souad Ayadi, Jehad Alzabut, Abdelkrim Salim. Fixed point approach for nonlinear ψ-caputo ­fractional differential hybrid coupled system with ­periodic boundary conditions. Results in Nonlinear Analysis [Internet]. 2023 Oct. 16 [cited 2024 Oct. 22];6(4):13-29. Available from: https://nonlinear-analysis.com/index.php/pub/article/view/318