1. K.S. Miller, B. Ross, An Introduction to the Fractional Calculus and Fractional Differential Equations (Wiley, New York, 1993)
2. R. Gorenflo, F. Mainardi, Fractals and Fractional Calculus in Continuum Mechanics, edited by A. Carpinteri, F. Mainard (Springer Verlag, Wien, 1997), p. 223 [e-print in http://arxiv.org/abs/0805.3823]
3. J.A. Tenreiro Machado, V. Kiryakova, F. Mainardi, Frac. Calc. Appl. 13, 447 (2010)
4. F. Mainardi, An historial perspective on fractional calculus in linear viscoelasticity, [e-print http://arxiv.org/abs/007.2959]
5. F. Mainardi, Fractional Calculus and Waves in Linear Viscoelasticiy (Imperial College Press, London, 2010)