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3. AÉRO, E.L., and E.V. KUVSHINSKI. The continual theory of asymmetrical elasticity. Equilibrium of an isotropic body (in Russian). Ibid., 6, No. 9, 1964, 2689–2699.
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5. AGMON, S., A. DOUGLIS and L. NIRENBERG. Estimates near the boundary for solutions of elliptic partial differential equations satisfying general boundary conditions. II Comm. Pure Math., 17, No. 1, 1964, 35–92.