On logarithms of normal positive operators
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 16 (1961) no. 3

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@article{RM_1961_16_3_a18,
     author = {P. E. Sobolevskii},
     title = {On logarithms of normal positive operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1961_16_3_a18/}
}
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P. E. Sobolevskii. On logarithms of normal positive operators. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 16 (1961) no. 3. http://geodesic.mathdoc.fr/item/RM_1961_16_3_a18/