1. Al-Bassam, M. A. and Luchko, Yu. F., On generalized fractional calculus and its application to the solution of integro-differential equations, J. Fract. Calc., 7 (1995), 69–88.
2. Alonso, J., On differential equations of fractional order, Diss. Abstrs., 26 (1964), no. 4, 947.
3. Bonilla, B., Kilbas, A. A., Rivero, M., Rodriguez, L., and Trujillo, J. J., Modified Bessel-type function and solution of differential and integral equations, Indian J. Pure Appl. Math., 31 (2000), no. 1, 93–109.
4. Campos, L. M. B. C., On the solution of some simple fractional differential equations, Internat. J. Math. Math. Sci., 13 (1990), no. 3, 481–496.
5. Dimovski, I. H., Operational calculus for a class of differential operators, C.R. Acad. Bulgar. Sci., 19 (1966), no. 12, 1111–1114.