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Schwermer, J., Vogtmann, K. The integral homology ofSL 2 andPSL 2 of euclidean imaginary quadratic integers. Commentarii Mathematici Helvetici 58, 573–598 (1983). https://doi.org/10.1007/BF02564653
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DOI: https://doi.org/10.1007/BF02564653