@article{DAN_1988_298_1_a4,
     author = {A. I. Koshelev},
     title = {Smoothness of the solutions of some nonlinear boundary value},
     journal = {Doklady Akademii Nauk},
     pages = {26--28},
     publisher = {mathdoc},
     volume = {298},
     number = {1},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_298_1_a4/}
}