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@article{10_4064_fm_65_3_351_358, author = {Jack Ceder}, title = {Differentiable roads for real functions}, journal = {Fundamenta Mathematicae}, pages = {351--358}, publisher = {mathdoc}, volume = {65}, number = {3}, year = {1969}, doi = {10.4064/fm-65-3-351-358}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-65-3-351-358/} }
Jack Ceder. Differentiable roads for real functions. Fundamenta Mathematicae, Tome 65 (1969) no. 3, pp. 351-358. doi : 10.4064/fm-65-3-351-358. http://geodesic.mathdoc.fr/articles/10.4064/fm-65-3-351-358/
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