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On copositive matrices and strong ellipticity for isotropic elastic materials

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References

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Communicated by E. Sternberg

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Simpson, H.C., Spector, S.J. On copositive matrices and strong ellipticity for isotropic elastic materials. Arch. Rational Mech. Anal. 84, 55–68 (1983). https://doi.org/10.1007/BF00251549

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