%0 Journal Article %A Ken Nakamula %T Class number calculation of a quartic field from the elliptic unit %J Acta Arithmetica %D 1985 %P 215-227 %V 45 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-45-3-215-227/ %R 10.4064/aa-45-3-215-227 %G en %F 10_4064_aa_45_3_215_227