@article{CMH_1983__58_139955,
     author = {Joachim Schwermer and Karen Vogtmann},
     title = {The integral homology of {SL2} and {PSL2} of euclidean imaginary quadratic integers.},
     journal = {Commentarii mathematici Helvetici},
     pages = {573--598},
     publisher = {mathdoc},
     volume = {58},
     year = {1983},
     zbl = {0545.20031},
     url = {http://geodesic.mathdoc.fr/item/CMH_1983__58_139955/}
}