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@article{DAN_1960_131_2_a4, author = {I. A. Kipriyanov}, title = {The fractional differentiation operator and powers of elliptic operators}, journal = {Doklady Akademii Nauk}, pages = {238--241}, publisher = {mathdoc}, volume = {131}, number = {2}, year = {1960}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1960_131_2_a4/} }
I. A. Kipriyanov. The fractional differentiation operator and powers of elliptic operators. Doklady Akademii Nauk, Tome 131 (1960) no. 2, pp. 238-241. http://geodesic.mathdoc.fr/item/DAN_1960_131_2_a4/