@article{DAN_1962_145_2_a10,
     author = {V. K. Ivanov},
     title = {On linear problems which are not well-posed},
     journal = {Doklady Akademii Nauk},
     pages = {270--272},
     publisher = {mathdoc},
     volume = {145},
     number = {2},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_145_2_a10/}
}