@article{DAN_1984_276_4_a5,
     author = {I. D. Turetaev},
     title = {Estimation of the error of an efficient difference scheme for the},
     journal = {Doklady Akademii Nauk},
     pages = {799--804},
     year = {1984},
     volume = {276},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_276_4_a5/}
}