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@article{10_4064_cm_25_2_265_267, author = {P. Kostyrko}, title = {On the symmetric derivative}, journal = {Colloquium Mathematicum}, pages = {265--267}, publisher = {mathdoc}, volume = {25}, number = {2}, year = {1972}, doi = {10.4064/cm-25-2-265-267}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-25-2-265-267/} }
P. Kostyrko. On the symmetric derivative. Colloquium Mathematicum, Tome 25 (1972) no. 2, pp. 265-267. doi : 10.4064/cm-25-2-265-267. http://geodesic.mathdoc.fr/articles/10.4064/cm-25-2-265-267/
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