%0 Journal Article %A E.M. Stein %A C.D. Sogge %T Averages of functions over hypersurfaces in Rn. %J Inventiones mathematicae %D 1985 %P 543-556 %V 82 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1985__82_143299/ %F IM_1985__82_143299