A. Afrouzi, Ghasem, Samad Mohseni Kolagar, Armin Hadjian, and Jiafa Xu. “Variational Approach for a Class of Two-Point Fractional Boundary Value Systems”. MATEMATIKA 34, no. 2 (December 30, 2018): 351–364. Accessed April 25, 2024. https://matematika.utm.my/index.php/matematika/article/view/898.