Geodesic
The Siegel–Brauer theorem concerning parameters of algebraic number fields
Matematičeskie zametki, Tome 8 (1970) no. 2, pp. 259-263 
A. F. Lavrik. The Siegel–Brauer theorem concerning parameters of algebraic number fields. Matematičeskie zametki, Tome 8 (1970) no. 2, pp. 259-263. http://geodesic.mathdoc.fr/item/MZM_1970_8_2_a14/
@article{MZM_1970_8_2_a14,
     author = {A. F. Lavrik},
     title = {The {Siegel{\textendash}Brauer} theorem concerning parameters of algebraic number fields},
     journal = {Matemati\v{c}eskie zametki},
     pages = {259--263},
     year = {1970},
     volume = {8},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_8_2_a14/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

An upper bound is obtained for the product of the number of classes of ideals and the regulator of algebraic number fields.