@article{IM_1987__89_143492,
     author = {K. Rubin},
     title = {Global units and ideal class groups.},
     journal = {Inventiones mathematicae},
     pages = {511--526},
     publisher = {mathdoc},
     volume = {89},
     year = {1987},
     zbl = {0628.12007},
     url = {http://geodesic.mathdoc.fr/item/IM_1987__89_143492/}
}