1. An introduction to fractional calculus and fractional differential equations;Miller,1993
2. Fractional-order systems and controls;Monje,2010
3. The fractional calculus;Oldham,1974
4. Approximation of high order integer systems by fractional order reduced parameter models;Mansouri;Math Comput Modelling,2010
5. Babusci D, Dattoli G. On the logarithm of the derivative operator, ArXiv e-prints. 2011.