Bastos, Nuno R. O. “Calculus of Variations Involving Caputo-Fabrizio Fractional Differentiation”. Statistics, Optimization & Information Computing 6, no. 1 (February 27, 2018): 12-21. Accessed April 26, 2024. http://www.iapress.org/index.php/soic/article/view/soic.20180303.