@article{MAN_1986__274_164096,
     author = {Harold P. Boas and Mei-Chi Shaw},
     title = {Sobolev {Estimates} for the {Lewy} {Operator} on {Weakly} {Pseudo-Convex} {Boundaries.}},
     journal = {Mathematische Annalen},
     pages = {221--232},
     publisher = {mathdoc},
     volume = {274},
     year = {1986},
     zbl = {0588.32023},
     url = {http://geodesic.mathdoc.fr/item/MAN_1986__274_164096/}
}