@article{MS2_1975__37_166427,
     author = {Tauno Mets\"ankyl\"a},
     title = {On the cyclotomic invariants of {Iwasawa.}},
     journal = {Mathematica Scandinavica},
     pages = {61--75},
     publisher = {mathdoc},
     volume = {37},
     year = {1975},
     zbl = {0314.12004},
     url = {http://geodesic.mathdoc.fr/item/MS2_1975__37_166427/}
}