@article{DAN_1989_307_5_a8,
     author = {Yu. I. Shokin and A. I. Urusov},
     title = {Differential representation of difference schemes with},
     journal = {Doklady Akademii Nauk},
     pages = {1065--1067},
     year = {1989},
     volume = {307},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_307_5_a8/}
}