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Johnen, H., Scherer, K. (1977). On the equivalence of the K-functional and moduli of continuity and some applications. In: Schempp, W., Zeller, K. (eds) Constructive Theory of Functions of Several Variables. Lecture Notes in Mathematics, vol 571. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0086569
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DOI: https://doi.org/10.1007/BFb0086569
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