@article{DAN_1990_312_3_a8,
     author = {N. A. Bobylev and I. G. Ismailov and A. I. Propoi},
     title = {The continuation method in the problem of the approximate},
     journal = {Doklady Akademii Nauk},
     pages = {550--554},
     publisher = {mathdoc},
     volume = {312},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_312_3_a8/}
}