Sharp a priori error estimates of the Rayleigh--Ritz method without assumptions of fixed sign or compactness
Matematičeskie zametki, Tome 38 (1985) no. 6, pp. 900-907.

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     author = {A. V. Knyazev},
     title = {Sharp a priori error estimates of the {Rayleigh--Ritz} method without assumptions of fixed sign or compactness},
     journal = {Matemati\v{c}eskie zametki},
     pages = {900--907},
     publisher = {mathdoc},
     volume = {38},
     number = {6},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1985_38_6_a10/}
}
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A. V. Knyazev. Sharp a priori error estimates of the Rayleigh--Ritz method without assumptions of fixed sign or compactness. Matematičeskie zametki, Tome 38 (1985) no. 6, pp. 900-907. http://geodesic.mathdoc.fr/item/MZM_1985_38_6_a10/