@article{DAN_1961_137_3_a6,
     author = {N. V. Marchenko},
     title = {The existence of solutions of a certain class of non-linear integral equations},
     journal = {Doklady Akademii Nauk},
     pages = {515--518},
     publisher = {mathdoc},
     volume = {137},
     number = {3},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_137_3_a6/}
}