@article{DAN_1964_159_1_a1,
     author = {A. Yu. Levin},
     title = {The {Fredholm} equation with smooth kernel and boundary-value problems for a linear differential equation},
     journal = {Doklady Akademii Nauk},
     pages = {13--16},
     publisher = {mathdoc},
     volume = {159},
     number = {1},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_159_1_a1/}
}