%0 Journal Article %A Robert Fefferman %A Fernando Soria %T The space Weak H¹ %J Studia Mathematica %D 1987 %P 1-16 %V 85 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4064/sm-85-1-1-16/ %R 10.4064/sm-85-1-1-16 %G en %F 10_4064_sm_85_1_1_16