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Communicated by H. F. Weinberger
In memory of Nachman Aronszain
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Greenlee, W.M. A convergent variational method of eigenvalue approximation. Arch. Rational Mech. Anal. 81, 279–287 (1983). https://doi.org/10.1007/BF00250803
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DOI: https://doi.org/10.1007/BF00250803