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Partly supported by the Israeli Academy of Sciences.
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Braess, D., Dyn, N. On the uniqueness of monosplines and perfect splines of leastL 1-andL 2-norm. J. Anal. Math. 41, 217–233 (1982). https://doi.org/10.1007/BF02803402
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DOI: https://doi.org/10.1007/BF02803402