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@article{DAN_1957_113_1_a7, author = {V. M. Tsodyks}, title = {On sets of points where the derivative is $+\infty$ or $-\infty$ correspondingly}, journal = {Doklady Akademii Nauk}, pages = {36--38}, publisher = {mathdoc}, volume = {113}, number = {1}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1957_113_1_a7/} }
V. M. Tsodyks. On sets of points where the derivative is $+\infty$ or $-\infty$ correspondingly. Doklady Akademii Nauk, Tome 113 (1957) no. 1, pp. 36-38. http://geodesic.mathdoc.fr/item/DAN_1957_113_1_a7/