@article{10_4064_aa122_1_7,
     author = {Henri Johnston},
     title = {On the trace map between absolutely
 abelian number fields of equal conductor},
     journal = {Acta Arithmetica},
     pages = {63--74},
     year = {2006},
     volume = {122},
     number = {1},
     doi = {10.4064/aa122-1-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa122-1-7/}
}