Massopust, P. Interpolation and Approximation with Splines and Fractals. Oxford, England: Oxford University Press, p. 46, 2010.Samko,
S. G.; Kilbas, A. A.; and Marichev, O. I. Fractional
Integrals and Derivatives. Yverdon, Switzerland: Gordon and Breach, p. 22,
1993.