@article{DE_1981_17_7_a11,
     author = {I. E. Kaporin and E. S. Nikolaev},
     title = {The development of the method of fictitious unknowns~-- conjugate directions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1270--1279},
     publisher = {mathdoc},
     volume = {17},
     number = {7},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_7_a11/}
}