Team, Support. “On the Existence of Positive Solutions for a Boundary Valued Problem of Fractional Order: Moustafa El-Shahed”. Thai Journal of Mathematics 5, no. 1 (June 1, 2007): 143–150. Accessed December 22, 2024. https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/82.