@article{SM_2003_194_5_a3,
     author = {O. A. Mitina and V. M. Tyurin},
     title = {On invertibility of linear partial differential operators {in~H\"older} and {Sobolev} spaces},
     journal = {Sbornik. Mathematics},
     pages = {733--744},
     publisher = {mathdoc},
     volume = {194},
     number = {5},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2003_194_5_a3/}
}