@article{JRAM_1978__0303_0304_152063,
     author = {S. Gurak},
     title = {The {Hasse} norm principle in non-abelian extensions.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {314--318},
     publisher = {mathdoc},
     volume = {0303_0304},
     year = {1978},
     zbl = {0384.12006},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1978__0303_0304_152063/}
}