MathSciNet bibliographic data MR2813336 37H15 (37D25) Avila, Artur Density of positive Lyapunov exponents for ${\rm SL}(2,\Bbb{R})$${\rm SL}(2,\Bbb{R})$-cocycles. J. Amer. Math. Soc. 24 (2011), no. 4, 999–1014. Article

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