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This research was partially supported by the United States Air Force Office of Scientific Research of the Air Research and Development Command under contracts No. AF18 (600)-1223 and AF18 (600)-568. Reproduction in whole or part is permitted for any purpose of the United States Government.
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Devinatz, A. On the extensions of positive definite functions. Acta Math. 102, 109–134 (1959). https://doi.org/10.1007/BF02559570
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DOI: https://doi.org/10.1007/BF02559570