%0 Journal Article %T On Type of Periodicity and Ergodicity to a Class of Fractional Order Differential Equations %A Ravi P. Agarwal %A Bruno de Andrade %A Claudio Cuevas %J Advances in Difference Equations %D 2010 %I Springer %R 10.1155/2010/179750 %X We study several types of periodicity to a class of fractional order differential equations. %U http://dx.doi.org/10.1155/2010/179750