MathSciNet bibliographic data MR2769243 (2012a:11063) 11F75 (22E40) Rahm, Alexander D.; Fuchs, Mathias The integral homology of ${\rm PSL}\sb 2$${\rm PSL}\sb 2$ of imaginary quadratic integers with nontrivial class group. J. Pure Appl. Algebra 215 (2011), no. 6, 1443–1472. Article

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