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We thank the referces for their excellent suggestions which greatly improved the paper.
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Barrar, R.B., Loeb, H.L. On monosplines with odd multiplicity of least norm. J. Anal. Math. 33, 12–38 (1978). https://doi.org/10.1007/BF02790167
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DOI: https://doi.org/10.1007/BF02790167