Andrew V. Knyazev
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Optimal a priori error bounds for the Rayleigh-Ritz method
Mathematics of Computation
Rayleigh-Ritz Majorization Error Bounds with Applications to FEM
SIAM Journal on Matrix Analysis and Applications
$hp$-Finite Elements for Elliptic Eigenvalue Problems: Error Estimates Which Are Explicit with Respect to $\lambda$, $h$, and $p$
SIAM Journal on Numerical Analysis