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The work ofHartman was supported by the United States Air Force Office of Scientific Research under contract AF 18(603)-41; that ofWilcox by the United States Army through the Mathematics Research Center, U.S. Army, under contract DA-11-022-ORD-2059.
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Hartman, P., Wilcox, C. On solutions of the Helmholtz equation in exterior domains. Math Z 75, 228–255 (1961). https://doi.org/10.1007/BF01211023
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DOI: https://doi.org/10.1007/BF01211023