1. The Fractional Calculus: Theory and Applications of Differentiation and Integration to Arbitrary Order;Oldham,1974
2. Fractional Integrals and Derivatives: Theory and Applications;Samko,1993
3. Theory and applications of fractional differential equations;Kilbas,2006
4. Fractional order modelling of dynamic backlash;Tenreiro Machado;Mechatronics,2013