1. KALIA, R.N.: Recent advances in fractional calculus, (Global Publishing Company 1993)
2. MILLER, K.S., and ROSS, B.: An introduction to the fractional calculus and fractional differential equations, (Wiley 1993)
3. SAMKO, S.G., KILBAS, A.A., and MARICHEV, O.I.: Fractional integrals and derivatives—theory and applications, (Gordon and Breach Science Publishers 1987)
4. On a Concept of Derivative of Complex Order with Applications to Special Functions