%0 Journal Article %A K. Urbanik %T Reversibility in absolute-valued algebras %J Fundamenta Mathematicae %D 1962 %P 131-140 %V 51 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-51-2-131-140/ %R 10.4064/fm-51-2-131-140 %G en %F 10_4064_fm_51_2_131_140