Parihar, H. S., and R. Agarwal. “A Class of Multivalent Functions Defined by Generalized Ruscheweyh Derivatives Involving a General Fractional Derivative Operator”. Proyecciones (Antofagasta, On Line), vol. 33, no. 2, Mar. 2017, pp. 189-04, doi:10.4067/S0716-09172014000200005.