@article{DAN_1981_261_4_a7,
     author = {N. S. Nadirashvili},
     title = {A lemma on the inner derivative, and the uniqueness of the solution of the second boundary value problem for second order elliptic equations},
     journal = {Doklady Akademii Nauk},
     pages = {804--808},
     publisher = {mathdoc},
     volume = {261},
     number = {4},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_261_4_a7/}
}