@article{10_4064_sm_79_3_289_296,
     author = {Yang-Chun Chang and P. Tomas},
     title = {Invertibility of some second order differential operators},
     journal = {Studia Mathematica},
     pages = {289--296},
     publisher = {mathdoc},
     volume = {79},
     number = {3},
     year = {1984},
     doi = {10.4064/sm-79-3-289-296},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-79-3-289-296/}
}