Betancor, J., and J. Barrios. “Mikusinski’s Operational Calculus for an Operator Containing a Fractional Derivative”. Rev. Téc. Fac. Ing. Univ. Zulia, Vol. 16, no. 3, 1, http://www.produccioncientifica.luz.edu.ve/index.php/tecnica/article/view/5430.