@article{JRAM_1975__272_151534,
     author = {Itaru Yamaguchi},
     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 = {272},
     year = {1975},
     zbl = {0313.12003},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1975__272_151534/}
}