@article{JRAM_1978__0299_0300_151981,
     author = {S. Gurak},
     title = {On the {Hasse} norm principle.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {16--27},
     publisher = {mathdoc},
     volume = {0299_0300},
     year = {1978},
     zbl = {0367.12006},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1978__0299_0300_151981/}
}