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The work was sponsored by the U.S. Army Research Office-Durham, Grant DA-AROD-31-124-G855, University of California, Los Angeles.
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Nakai, M., Sario, L. A new operator for elliptic equations, and theP-compactification for Δu=Pu . Math. Ann. 189, 242–256 (1970). https://doi.org/10.1007/BF01359704
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DOI: https://doi.org/10.1007/BF01359704