@article{IM_1986__86_143394,
     author = {E.M. Stein and C.D. Sogge},
     title = {Averages over hypersurfaces. {II.}},
     journal = {Inventiones mathematicae},
     pages = {233--242},
     publisher = {mathdoc},
     volume = {86},
     year = {1986},
     zbl = {0656.42012},
     url = {http://geodesic.mathdoc.fr/item/IM_1986__86_143394/}
}