Sukalwad, Umesh, and Rajkumar Ingle. “Lyapunov and Hartman–Wintner Inequalities for Caputo–Fabrizio Fractional Dirichlet Boundary Value Problems”. Serdica Mathematical Journal 52, no. 3 (September 25, 2026): 249–268. Accessed October 4, 2026. https://serdica.math.bas.bg/index.php/serdica/article/view/324.