@article{DAN_1962_146_1_a6,
     author = {M. A. Krasnosel'skii and P. E. Sobolevskii},
     title = {The structure of the set of solutions of equations of parabolic type},
     journal = {Doklady Akademii Nauk},
     pages = {26--29},
     publisher = {mathdoc},
     volume = {146},
     number = {1},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_146_1_a6/}
}