MathSciNet bibliographic data MR2512632 20F28 (20E05) Appel, Daniel; Ribnere, Evija On the index of congruence subgroups of ${\rm Aut}(F_n)$${\rm Aut}(F_n)$. J. Algebra 321 (2009), no. 10, 2875–2889. Article

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