@article{JRAM_1976__0286_0287_151771,
     author = {H.C. Williams},
     title = {Some reults on fundamental units in cubic fields.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {75--85},
     publisher = {mathdoc},
     volume = {0286_0287},
     year = {1976},
     zbl = {0335.12009},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1976__0286_0287_151771/}
}