@article {MR1008225, title = {Lyapunov spectrum of ergodic stationary systems perturbed by white noise}, journal = {Stochastics Stochastics Rep.}, volume = {27}, number = {1}, year = {1989}, pages = {23{\textendash}31}, issn = {1045-1129}, author = {Nguyen Huu Du and Tr\cfgrvan V{\u a}n Nhung} }