%0 Journal Article %A C. Morpurgo %T The Logarithmic Hardy-Littlewood-Sobolev Inequlity and Extremals of Zeta Functions on Sn. %J Geometric and functional analysis %D 1996 %P 146-171 %V 6 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/GFA_1996__6_1_58222/ %F GFA_1996__6_1_58222