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On semigroups with singularities summable with a powerweight at zero. (English. Russian original) Zbl 0226.47018
Sov. Math., Dokl. 11, 1408-1411 (1970); translation from Dokl. Akad. Nauk SSSR 195, 24-27 (1970).

MSC:
47D03 Groups and semigroups of linear operators
47A10 Spectrum, resolvent
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