@article{IM_1987__87_143437,
     author = {P. Schneider},
     title = {Arithmetic of formal groups and applications {I:} {Universal} norm subgroups.},
     journal = {Inventiones mathematicae},
     pages = {587--602},
     publisher = {mathdoc},
     volume = {87},
     year = {1987},
     zbl = {0608.14034},
     url = {http://geodesic.mathdoc.fr/item/IM_1987__87_143437/}
}