@article{IVM_2022_9_a4,
     author = {A.V.Lakeev and Yu. \`E Linke and V. A. Rusanov},
     title = {Metric properties of the {Rayleigh{\textendash}Ritz} operator},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {54--63},
     year = {2022},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2022_9_a4/}
}