Asymptotic stability of linear fractional systems with constant   coefficients and small time dependent perturbations
  Our aim in this paper is to investigate the asymptotic behavior of solutions of the perturbed linear fractional differential system. We show that if the original linear autonomous system is asymptotically stable then under the action of small (either linear or nonlinear) nonautonomous perturbations the trivial solution of the perturbed system is also asymptotically stable. 
N.D. Cong, T.S. Doan and H.T. Tuan
math.DS