%0 Journal Article %A Sedláček, Vladimír %T Circular units of real abelian fields with four ramified primes %J Archivum mathematicum %D 2017 %P 221-252 %V 53 %N 4 %I mathdoc %U https://geodesic-test.mathdoc.fr/articles/10.5817/AM2017-4-221/ %R 10.5817/AM2017-4-221 %G en %F 10_5817_AM2017_4_221