@article{SM_1990_65_1_a1,
     author = {A. K. Gushchin},
     title = {On the {Dirichlet} problem for a second-order elliptic equation},
     journal = {Sbornik. Mathematics},
     pages = {19--66},
     publisher = {mathdoc},
     volume = {65},
     number = {1},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1990_65_1_a1/}
}