On the first derivative of real functions (Preliminary communication)
David Preiss (1970)
Commentationes Mathematicae Universitatis Carolinae
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David Preiss (1970)
Commentationes Mathematicae Universitatis Carolinae
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Ivo Marek (1962)
Commentationes Mathematicae Universitatis Carolinae
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Josef Daneš (1970)
Commentationes Mathematicae Universitatis Carolinae
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