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The paper is partially supported by the Polish Committee for Scientific Research under grant no. 220099102
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Rolewicz, S. Generalization of Asplund inequalities on Lipschitz functions. Arch. Math 61, 484–488 (1993). https://doi.org/10.1007/BF01207548
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DOI: https://doi.org/10.1007/BF01207548