@article{oai:niigata-u.repo.nii.ac.jp:00001984, author = {Takeuchi, Teruo}, issue = {2}, journal = {Japanese journal of mathematics. New series}, month = {}, pages = {231--268}, title = {The Hasse norm principle modulo m of finite Galois extensions of algebraic number fields and a generalization of a theorem of Frohlich on the I-divisibility of the class numbers of I-abelian fields}, volume = {20}, year = {1994} }