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Communicated by J. Serrin
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Korevaar, N.J., Lewis, J.L. Convex solutions of certain elliptic equations have constant rank hessians. Arch. Rational Mech. Anal. 97, 19–32 (1987). https://doi.org/10.1007/BF00279844
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DOI: https://doi.org/10.1007/BF00279844