Geodesic
Lower bounds for the upper Lyapunov exponent in one-parameter families of Millionshchikov systems
Trudy Seminara im. I.G. Petrovskogo, Trudy Seminara imeni I. G. Petrovskogo, Tome 30 (2014) no. 30, pp. 171-177 
A. V. Lipnitskii. Lower bounds for the upper Lyapunov exponent in one-parameter families of Millionshchikov systems. Trudy Seminara im. I.G. Petrovskogo, Trudy Seminara imeni I. G. Petrovskogo, Tome 30 (2014) no. 30, pp. 171-177. http://geodesic.mathdoc.fr/item/TSP_2014_30_30_a8/
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

For a special class of two-dimensional differential systems of the form $\dot {x}=(A(t)+\mu B(t))x$, in particular, the Lyapunov improper almost periodic systems constructed by V. M. Millionshchikov, it is shown that the upper characteristic exponent $\lambda_2(A + \mu B)$ is positive for all $\mu$ from a set of positiv Lebesgue measure.

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