@article{DE_1994_30_12_a8,
     author = {S. S. Belyavsky and S. G. Mulyarchick and A. W. Popov},
     title = {A preconditioned conjugate gradient method with dual projection},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2106--2115},
     publisher = {mathdoc},
     volume = {30},
     number = {12},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_12_a8/}
}