Prasad G, Rapinchuk A. Developments on the congruence subgroup problem after the work of Bass, Milnor and Serre. In: Collected papers of John Milnor. Algebra. Vol. V. Providence, RI: Amer. Math. Soc; 2010. pp. 307–325. Reprint557.72 KB Last updated on 12/11/2020
