@article{FAA_1994_28_3_a6,
     author = {L. S. Dzhanlatyan},
     title = {Basis {Properties} of the {System} of {Root} {Vectors} for {Weak} {Perturbations} of a {Normal} {Operator}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {69--73},
     publisher = {mathdoc},
     volume = {28},
     number = {3},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1994_28_3_a6/}
}