@article{DE_1989_25_9_a24,
     author = {V. G. Prikazchikov and G. K. Berikelashvili},
     title = {Schemes of increased accuracy for an elliptic equation with a mixed derivative},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1622--1624},
     publisher = {mathdoc},
     volume = {25},
     number = {9},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_9_a24/}
}