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Sponsored by the Mathematics Research Center, United States Army, Madison, Wisconsin, under Contract No.: DA-11-022-ORD-2059.
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Curry, H.B., Schoenberg, I.J. On Pólya frequency functions IV: The fundamental spline functions and their limits. J. Anal. Math. 17, 71–107 (1966). https://doi.org/10.1007/BF02788653
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DOI: https://doi.org/10.1007/BF02788653