Geodesic
On self-adjoint operators connected by inequalities and on their applications to problems of mathematical physics
Matematičeskie zametki, Tome 55 (1994) no. 6, pp. 3-12 
T. Ya. Azizov; V. L. Khatskevich. On self-adjoint operators connected by inequalities and on their applications to problems of mathematical physics. Matematičeskie zametki, Tome 55 (1994) no. 6, pp. 3-12. http://geodesic.mathdoc.fr/item/MZM_1994_55_6_a0/
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