%0 Journal Article %A Joseph Liang %T On relations between units of normal algebraic number fields and their subfields %J Acta Arithmetica %D 1972 %P 331-344 %V 20 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-20-4-331-344/ %R 10.4064/aa-20-4-331-344 %G en %F 10_4064_aa_20_4_331_344