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@article{10_4064_cm_10_2_281_285, author = {K. Krzy\.zewski}, title = {Note on approximative derivative}, journal = {Colloquium Mathematicum}, pages = {281--285}, publisher = {mathdoc}, volume = {10}, number = {2}, year = {1963}, doi = {10.4064/cm-10-2-281-285}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-10-2-281-285/} }
K. Krzyżewski. Note on approximative derivative. Colloquium Mathematicum, Tome 10 (1963) no. 2, pp. 281-285. doi : 10.4064/cm-10-2-281-285. http://geodesic.mathdoc.fr/articles/10.4064/cm-10-2-281-285/
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