@article{DAN_1960_135_1_a1,
     author = {V. L. Levin},
     title = {Non-degenerate spectra of locally convex spaces},
     journal = {Doklady Akademii Nauk},
     pages = {12--15},
     publisher = {mathdoc},
     volume = {135},
     number = {1},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_135_1_a1/}
}