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3. A. M. Nakhushev, Fractional Calculus and Its Applications (Fizmatlit, Moscow, 2003) [in Russian].
4. A. V. Pskhu, Equations with Fractional-Order Partial Derivatives (Nauka, Moscow, 2005) [in Russian].
5. A. A. Kilbas, H. M. Srivastava, and J. J. Trujillo, Theory and Applications of Fractional Differential Equations (Elsevier, New York, 2006).