@article{10_4064_aa_23_2_107_116,
     author = {Tauno Mets\"ankyl\"a},
     title = {A class number congruence for cyclotomic fields and their subfields},
     journal = {Acta Arithmetica},
     pages = {107--116},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1973},
     doi = {10.4064/aa-23-2-107-116},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-23-2-107-116/}
}