@article{MAN_1978__233_163114,
     author = {Werner Meyer},
     title = {Konvexe {Untergruppen} in algebraischen {Zahlk\"orpern.}},
     journal = {Mathematische Annalen},
     pages = {275--284},
     year = {1978},
     volume = {233},
     zbl = {0361.06016},
     url = {http://geodesic.mathdoc.fr/item/MAN_1978__233_163114/}
}