@article{MAN_1978__234_163117,
     author = {Bruce Ferrero},
     title = {Iwasawa {Invariants} of {Abelian} {Number} {Fields.}},
     journal = {Mathematische Annalen},
     pages = {9--24},
     publisher = {mathdoc},
     volume = {234},
     year = {1978},
     zbl = {0347.12004},
     url = {http://geodesic.mathdoc.fr/item/MAN_1978__234_163117/}
}