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@article{DAN_1975_225_6_a8, author = {P. E. Sobolevskii}, title = {Fractional powers of coercively positive sums of operators}, journal = {Doklady Akademii Nauk}, pages = {1271--1274}, publisher = {mathdoc}, volume = {225}, number = {6}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1975_225_6_a8/} }
P. E. Sobolevskii. Fractional powers of coercively positive sums of operators. Doklady Akademii Nauk, Tome 225 (1975) no. 6, pp. 1271-1274. http://geodesic.mathdoc.fr/item/DAN_1975_225_6_a8/