%0 Journal Article %A Mazur, Marcin %A Ullom, Stephen V. %T Unit indices and cohomology for biquadratic extensions of imaginary quadratic fields %J Journal de théorie des nombres de Bordeaux %D 2008 %P 183-204 %V 20 %N 1 %I Université Bordeaux 1 %U http://www.numdam.org/articles/10.5802/jtnb.621/ %R 10.5802/jtnb.621 %G en %F JTNB_2008__20_1_183_0