@article{JRAM_1965__217_150668,
     author = {H. Hasse and S. Chowla and N.C. Ankeny},
     title = {On the class-number of the maximal real subfield of a cyclotomic field.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {217--220},
     publisher = {mathdoc},
     volume = {217},
     year = {1965},
     zbl = {0128.03501},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1965__217_150668/}
}