@article{105575, author = {Ji\v r\'\i\ Durdil}, title = {On the geometric characterization of differentiability. I.}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {015}, year = {1974}, pages = {521-540}, zbl = {0289.58004}, mrnumber = {0426019}, language = {en}, url = {http://dml.mathdoc.fr/item/105575} }
Durdil, Jiří. On the geometric characterization of differentiability. I.. Commentationes Mathematicae Universitatis Carolinae, Tome 015 (1974) pp. 521-540. http://gdmltest.u-ga.fr/item/105575/
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