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Veidinger, L. On the order of convergence of the Rayleigh-Ritz method with piecewise linear trial functions. Acta Mathematica Academiae Scientiarum Hungaricae 23, 507–517 (1972). https://doi.org/10.1007/BF01896969
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DOI: https://doi.org/10.1007/BF01896969