@article{MZ_1990__203_3_174138,
     author = {Joachim Michel and Alessandro Perotti},
     title = {Ck-Regularity for the ?-equation on {Strictly} {Pseudoconvex} {Domains} with {Piecewise} {Smooth} {Boundaries.}},
     journal = {Mathematische Zeitschrift},
     pages = {415--428},
     publisher = {mathdoc},
     volume = {203},
     number = {3},
     year = {1990},
     zbl = {0673.32019},
     url = {http://geodesic.mathdoc.fr/item/MZ_1990__203_3_174138/}
}