@article{DAN_1971_196_2_a2,
     author = {Yu. N. Vladimirskii},
     title = {Bounded perturbations of $\Phi$-operators in locally convex spaces},
     journal = {Doklady Akademii Nauk},
     pages = {263--265},
     publisher = {mathdoc},
     volume = {196},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_196_2_a2/}
}