Finite-time Lyapunov exponents of Strange Nonchaotic Attractors
  The probability distribution of finite-time Lyapunov exponents provides an important characterization of dynamical attractors. We study such distributions for strange nonchaotic attractors (SNAs) created through several different mechanisms in quasiperiodically forced nonlinear dynamical systems. Statistical properties of the distributions such as the variance and the skewness also distinguish between SNAs formed by different bifurcation routes. 
Awadhesh Prasad and Ramakrishna Ramaswamy