@article{DE_1989_25_7_a20,
     author = {V. G. Prikazchikov and Zh. P. Allanazarov},
     title = {A scheme of fourth-order accuracy in a spectral problem for an equation with a mixed derivative},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1250--1255},
     publisher = {mathdoc},
     volume = {25},
     number = {7},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_7_a20/}
}