@article{JRAM_1978__298_151972,
     author = {Sudesh K. Gogia and S. Luthar},
     title = {Quadratic unramified extensions of {Q} (... d).},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {108--111},
     publisher = {mathdoc},
     volume = {298},
     year = {1978},
     zbl = {0393.12004},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1978__298_151972/}
}