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• Volume 15

Author: Durdil, Jiří

• Durdil, Jiří: On the geometric characterization of differentiability. I. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 15 (1974), issue 3, pp. 521-540
• Durdil, Jiří: On the geometric characterization of differentiability. II. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 15 (1974), issue 4, pp. 727-744