Barrios, Melani, Gabriela Reyero, and Mabel Tidball. “Necessary Conditions to A Fractional Variational Problem”. Statistics, Optimization & Information Computing 10, no. 2 (February 5, 2022): 426–438. Accessed May 25, 2026. https://iapress.org/index.php/soic/article/view/1047.