@article{JRAM_1966__221_150721,
     author = {Heinrich W. Leopoldt},
     title = {L\"osung einer {Aufgabe} von {Kostrikhin.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {160--161},
     publisher = {mathdoc},
     volume = {221},
     year = {1966},
     zbl = {0139.26707},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1966__221_150721/}
}