Geodesic
On conditions for the positive-definiteness of operators in a Hilbert space
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (2002), pp. 17-20 
S. A. Gusarenko. On conditions for the positive-definiteness of operators in a Hilbert space. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (2002), pp. 17-20. http://geodesic.mathdoc.fr/item/IVM_2002_1_a3/
@article{IVM_2002_1_a3,
     author = {S. A. Gusarenko},
     title = {On conditions for the positive-definiteness of operators in a {Hilbert} space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {17--20},
     year = {2002},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2002_1_a3/}
}
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[2] Krein S. G., Funktsionalnyi analiz, Nauka, M., 1972, 544 pp. | MR | Zbl