A certain class of operators with spectrum concentrated at zero
Doklady Akademii Nauk, Tome 178 (1968) no. 4, pp. 783-785.

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     author = {L. E. Isaev},
     title = {A certain class of operators with spectrum concentrated at zero},
     journal = {Doklady Akademii Nauk},
     pages = {783--785},
     publisher = {mathdoc},
     volume = {178},
     number = {4},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_178_4_a7/}
}
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L. E. Isaev. A certain class of operators with spectrum concentrated at zero. Doklady Akademii Nauk, Tome 178 (1968) no. 4, pp. 783-785. http://geodesic.mathdoc.fr/item/DAN_1968_178_4_a7/