@article{JRAM_1972__257_151270,
     author = {Leon Bernstein},
     title = {On units and fundamental units.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {129--145},
     publisher = {mathdoc},
     volume = {257},
     year = {1972},
     zbl = {0247.12007},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1972__257_151270/}
}