Kilbas, Anatoly, and Anatoly Titioura. “Nonlinear Differential Equations With Marchaud‐hadamard‐type Fractional Derivative in the Weighted Space of Summable Functions”. Mathematical Modelling and Analysis 12, no. 3 (September 30, 2007): 343-356. Accessed November 21, 2019. https://journals.vgtu.lt/index.php/MMA/article/view/7133.