%0 Journal Article %A Piotr Niemiec %T Urysohn universal spaces as metric groups of exponent 2 %J Fundamenta Mathematicae %D 2009 %P 1-6 %V 204 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm204-1-1/ %R 10.4064/fm204-1-1 %G en %F 10_4064_fm204_1_1