%0 Journal Article %A Yang-Chun Chang %A P. Tomas %T Invertibility of some second order differential operators %J Studia Mathematica %D 1984 %P 289-296 %V 79 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-79-3-289-296/ %R 10.4064/sm-79-3-289-296 %G en %F 10_4064_sm_79_3_289_296