@article{IM_1973__19_142188,
     author = {R. Zimmert},
     title = {Zur {SL2} der ganzen {Zahlen} eines imagin\"ar-quadratischen {Zahlk\"orpers.}},
     journal = {Inventiones mathematicae},
     pages = {73--82},
     publisher = {mathdoc},
     volume = {19},
     year = {1973},
     zbl = {0254.10019},
     url = {http://geodesic.mathdoc.fr/item/IM_1973__19_142188/}
}