@article{DAN_1990_315_2_a12,
     author = {D. A. Popov and D. V. Sushko},
     title = {Convergence of algorithms for the numerical solution of a},
     journal = {Doklady Akademii Nauk},
     pages = {309--313},
     publisher = {mathdoc},
     volume = {315},
     number = {2},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_315_2_a12/}
}