%0 Journal Article %A Sogge, Christopher D. %T Oscillatory integrals and unique continuation for second order elliptic differential equations %J Journal of the American Mathematical Society %D 1989 %P 491-515 %V 02 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1989-0999662-3/ %R 10.1090/S0894-0347-1989-0999662-3 %F 10_1090_S0894_0347_1989_0999662_3