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Communicated by J. Serrin
This work was partially supported by National Science Foundation Grant MC575-21416A02.
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Friedman, A. Reinforcement of the principal eigenvalue of an elliptic operator. Arch. Rational Mech. Anal. 73, 1–17 (1980). https://doi.org/10.1007/BF00283252
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DOI: https://doi.org/10.1007/BF00283252