Geodesic
Certain properties of concave functions of a selfadjoint operator
Doklady Akademii Nauk, Tome 186 (1969) no. 6, pp. 1259-1261.

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@article{DAN_1969_186_6_a6,
     author = {E. I. Pustyl'nik},
     title = {Certain properties of concave functions of a selfadjoint operator},
     journal = {Doklady Akademii Nauk},
     pages = {1259--1261},
     publisher = {mathdoc},
     volume = {186},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_186_6_a6/}
}
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E. I. Pustyl'nik. Certain properties of concave functions of a selfadjoint operator. Doklady Akademii Nauk, Tome 186 (1969) no. 6, pp. 1259-1261. http://geodesic.mathdoc.fr/item/DAN_1969_186_6_a6/