@article{VSGU_2009_8_a4,
     author = {E. M. Maleko},
     title = {About the directed disturbance of discrete operators},
     journal = {Vestnik Samarskogo universiteta. Estestvennonau\v{c}na\^a seri\^a},
     pages = {44--60},
     publisher = {mathdoc},
     number = {8},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGU_2009_8_a4/}
}