MathSciNet bibliographic data MR2358056 (2009g:22018) 22E30 (11B75 43A75) Bourgain, Jean; Gamburd, Alex On the spectral gap for finitely-generated subgroups of $\rm SU(2)$$\rm SU(2)$. Invent. Math. 171 (2008), no. 1, 83–121. Article

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