1. Samko, S.G., Kilbas, A.A., and Marichev, O.I., Integraly i proizvodnye drobnogo poryadka i nekotorye ikh prilozheniya (Fractional Integrals and Derivatives and Some of Their Applications), Minsk: Nauka i Tekhnika, 1987.
2. Erdélyi, A., Magnus, W., Oberhettinger, F., and Tricomi, F.G., Higher Transcendental Functions (Bateman Manuscript Project), New York: McGraw-Hill, 1953. Translated under the title Vysshie transtsendentnye funktsii, Moscow, 1973, Vol. 1.
3. Zaitsev, V.F. and Polyanin, A.D., Spravochnik po lineinym obyknovennym differentsial’nym uravneniyam (Reference Book on Linear Ordinary Differential Equations), Moscow, 1997.
4. Barrett, J.H., Differential Equation of Non-Integer Order, Canad. J. Math., 1954, vol. 6, no. 4, pp. 529–541.
5. Dzhrbashyan, M.M. and Nersesyan, A.B., Fractional Derivatives and Cauchy Problem for Fractional Differential Equations, Izv. Akad. Nauk Arm. SSR Mat., 1968, vol. 3, no. 1, pp. 3–29.