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This research was supported by the United States Air Force through the Air Force Office of Scientific Research of the Air Research and Development Command under contract No. AF 18 (603)-41. Reproduction in whole or in part is permitted for any purpose of the United States Government.
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Hartman, P. On solutions of ΔV+V=0 in an exterior region. Math Z 71, 251–257 (1959). https://doi.org/10.1007/BF01181401
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DOI: https://doi.org/10.1007/BF01181401