%0 Journal Article %A Swanson, C. A. %T Semilinear Second Order Elliptic Oscillation %J Canadian mathematical bulletin %D 1979 %P 139-157 %V 22 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1979-021-0/ %R 10.4153/CMB-1979-021-0 %F 10_4153_CMB_1979_021_0