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@article{DAN_1958_120_4_a9, author = {Yu. L. Shmul'yan}, title = {Hellinger's operator integral and some of its uses}, journal = {Doklady Akademii Nauk}, pages = {722--725}, publisher = {mathdoc}, volume = {120}, number = {4}, year = {1958}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1958_120_4_a9/} }
Yu. L. Shmul'yan. Hellinger's operator integral and some of its uses. Doklady Akademii Nauk, Tome 120 (1958) no. 4, pp. 722-725. http://geodesic.mathdoc.fr/item/DAN_1958_120_4_a9/