@article{DAN_1957_117_4_a2,
     author = {B. M. Budak and A. D. Gorbunov},
     title = {The difference method for solution of a non-linear {Goursat} problem},
     journal = {Doklady Akademii Nauk},
     pages = {559--562},
     publisher = {mathdoc},
     volume = {117},
     number = {4},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_117_4_a2/}
}