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@article{MAT_1968_12_1_a4, author = {R. T. Seeley}, title = {The powers $A^s$ of an elliptic operator~$A$}, journal = {Matematika}, pages = {96--112}, publisher = {mathdoc}, volume = {12}, number = {1}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1968_12_1_a4/} }
R. T. Seeley. The powers $A^s$ of an elliptic operator~$A$. Matematika, Tome 12 (1968) no. 1, pp. 96-112. http://geodesic.mathdoc.fr/item/MAT_1968_12_1_a4/