@article{DAN_1972_207_3_a6,
     author = {V. I. Matsaev and E. Z. Mogulski},
     title = {On the possibility of weak perturbation of a complete operator up to a {Volterra} operator},
     journal = {Doklady Akademii Nauk},
     pages = {534--537},
     publisher = {mathdoc},
     volume = {207},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_207_3_a6/}
}