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This paper was written while the authors were visiting Center of Approximation Theory, Texas A & M University, College Station, Texas. The second author wishes also to acknowledge the support of Max Kade Foundation
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Kroó, A., Peherstorfer, F. Interpolatory properties of bestL 1-approximants. Math Z 196, 249–257 (1987). https://doi.org/10.1007/BF01163659
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DOI: https://doi.org/10.1007/BF01163659