@article{GDZPPN002102323, title = {Averages of functions over hypersurfaces in Rn.}, journal = {Inventiones mathematicae}, volume = {82}, year = {1985}, pages = {543-556}, zbl = {0626.42009}, url = {http://dml.mathdoc.fr/item/GDZPPN002102323} }
Stein, E.M.; Sogge, C.D. Averages of functions over hypersurfaces in Rn.. Inventiones mathematicae, Tome 82 (1985) pp. 543-556. http://gdmltest.u-ga.fr/item/GDZPPN002102323/