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Prof. Dupont's research was supported in part by the Esso Production Research Co. The research of Prof. Serrin was supported in part by the United States Air Force under Grant AF-AFOSR 883-67.
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Douglas, J., Dupont, T. & Serrin, J. Uniqueness and comparison theorems for nonlinear elliptic equations in divergence form. Arch. Rational Mech. Anal. 42, 157–168 (1971). https://doi.org/10.1007/BF00250482
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DOI: https://doi.org/10.1007/BF00250482