“Generalized Quasilinearization Using Coupled Lower and Upper Solutions for Periodic Boundary Value Problem of an Integro Differential Equation”. European Journal of Pure and Applied Mathematics 12, no. 4 (October 31, 2019): 1662–1675. Accessed April 2, 2025. https://www.ejpam.com/index.php/ejpam/article/view/3529.