1. Dzhrbashyan, M.M. and Nersesyan, A.B., Fractional Derivatives and the Cauchy Problem for Fractional Differential Equations, Izv. Akad. Nauk Armyan. SSR, 1968, vol. 3, no. 1, pp. 3–29.
2. Nakhushev, A.M., Drobnoe ischislenie i ego primenenie (Fractional Calculus and Its Application), Moscow, 2003.
3. Diethelm, K. and Ford, N.J., Numerical Analysis for Distributed-Order Differential Equations, J. Comput. Appl. Math., 2009, vol. 225, pp. 96–104.
4. Volterra, V., Teoriya funktsionalov, integral’nykh i integro-differentsial’nykh uravnenii (Theory of Functionals and of Integral and Integro-Differential Equations), Moscow: Nauka, 1982.
5. Nakhushev, A.M., On the Theory of Fractional Calculus, Differ. Uravn., 1988, vol. 24, no. 2, pp. 313–324.