@article{GDZPPN002414813, title = {The Schur Subgroup of a Real Cyclotomic Field.}, journal = {Mathematische Zeitschrift}, volume = {136}, year = {1974}, pages = {35-44}, zbl = {0278.12002}, url = {http://dml.mathdoc.fr/item/GDZPPN002414813} }
Yamada, Toshihiko. The Schur Subgroup of a Real Cyclotomic Field.. Mathematische Zeitschrift, Tome 136 (1974) pp. 35-44. http://gdmltest.u-ga.fr/item/GDZPPN002414813/