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@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/} }
V. L. Levin. Non-degenerate spectra of locally convex spaces. Doklady Akademii Nauk, Tome 135 (1960) no. 1, pp. 12-15. http://geodesic.mathdoc.fr/item/DAN_1960_135_1_a1/