@article{DAN_1985_284_5_a9,
     author = {I. M. Petrushko},
     title = {Boundary values of solutions of second-order elliptic equations},
     journal = {Doklady Akademii Nauk},
     pages = {1069--1073},
     publisher = {mathdoc},
     volume = {284},
     number = {5},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_284_5_a9/}
}