@article{DAN_1991_319_5_a11,
     author = {N. A. Sidorov and E. B. Blagodatskaya},
     title = {Differential equations with a {Fredholm} operator in the main},
     journal = {Doklady Akademii Nauk},
     pages = {1087--1090},
     publisher = {mathdoc},
     volume = {319},
     number = {5},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_319_5_a11/}
}