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MR992814
(90f:47005)
47A20
(47A45 47B25 47B44)
Derkach, V. A.; Malamud, M. M.; Tsekanovskiĭ, È. R. Sectorial extensions of a positive operator, and the characteristic function. (Russian) Ukrain. Mat. Zh. 41 (1989), no. 2, 151--158, 286; translation in Ukrainian Math. J. 41 (1989), no. 2, 136--142 |
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