@article{DAN_1958_120_4_a6,
     author = {V. V. Pokornyi},
     title = {On the convergence of formal solutions of non-linear integral equations},
     journal = {Doklady Akademii Nauk},
     pages = {711--714},
     publisher = {mathdoc},
     volume = {120},
     number = {4},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_120_4_a6/}
}