@article{1028999301, author = {Brumer, A.}, title = {Ramification and class towers of number fields.}, journal = {Michigan Math. J.}, volume = {12}, number = {1}, year = {1965}, pages = { 129-131}, language = {en}, url = {http://dml.mathdoc.fr/item/1028999301} }
Brumer, A. Ramification and class towers of number fields.. Michigan Math. J., Tome 12 (1965) no. 1, pp. 129-131. http://gdmltest.u-ga.fr/item/1028999301/