%0 Journal Article %A Heima Hayashi %T On elliptic units and class number of a certain dihedral extension of degree 2l %J Acta Arithmetica %D 1984 %P 35-45 %V 44 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-44-1-35-45/ %R 10.4064/aa-44-1-35-45 %G en %F 10_4064_aa_44_1_35_45