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This research has been supported by the Air Force Office of Scientific Research.
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Kilgore, T.A., Cheney, E.W. A theorem on interpolation in haar subspaces. Aeq. Math. 14, 391–400 (1976). https://doi.org/10.1007/BF01835987
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DOI: https://doi.org/10.1007/BF01835987