Geodesic
Some unbounded symmetrizable operators in Hilbert spaces
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 15 (1960) no. 4 
D. F. Kharazov. Some unbounded symmetrizable operators in Hilbert spaces. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 15 (1960) no. 4. http://geodesic.mathdoc.fr/item/RM_1960_15_4_a15/
@article{RM_1960_15_4_a15,
     author = {D. F. Kharazov},
     title = {Some unbounded symmetrizable operators in {Hilbert} spaces},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1960},
     volume = {15},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_4_a15/}
}
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