@article{DAN_1985_283_1_a11,
     author = {G. V. Radzievskii},
     title = {Minimality, basis property and completeness of a subset of the root vectors of a quadratic operator pencil},
     journal = {Doklady Akademii Nauk},
     pages = {53--57},
     publisher = {mathdoc},
     volume = {283},
     number = {1},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_283_1_a11/}
}