@article{DE_1994_30_1_a6,
     author = {E. I. Nikol'skaya},
     title = {A component-wise estimate for the difference of partial sums of root vector function expansions, which correspond to two {Schr\"odinger} operators with {non-Hermitian} matrix potentials, for vector functions with monotone components},
     journal = {Differencialʹnye uravneni\^a},
     pages = {60--69},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_1_a6/}
}