1. The Fractional Calculus;Oldham,1974
2. Fractional Differential Equations;Podlubny,1999
3. Fractional Calculus: Some Basic Problems in Continuum and Statistical Mechanics;Mainardi,1996
4. Properties of Vibration with Fractional Derivative Damping of Order 1/2.
5. S. Westerlund, Causality, Technical Report 940426, INRIA, Kalmar, 1994