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This work was supported by the Office of Naval Research. It was completed in part while the authors were at Stanford University in the summer 1955.
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Gilbarg, D., Serrin, J. On isolated singularities of solutions of second order elliptic differential equations. J. Anal. Math. 4, 309–340 (1954). https://doi.org/10.1007/BF02787726
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DOI: https://doi.org/10.1007/BF02787726