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@article{MOMA_1962__66_177190, author = {Solomon Marcus}, title = {On a {Theorem} of {Denjoy} and on {Approximate} {Derivative.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {435--440}, publisher = {mathdoc}, volume = {66}, year = {1962}, zbl = {0111.05804}, url = {http://geodesic.mathdoc.fr/item/MOMA_1962__66_177190/} }
Solomon Marcus. On a Theorem of Denjoy and on Approximate Derivative.. Monatshefte für Mathematik, Tome 66 (1962), pp. 435-440. http://geodesic.mathdoc.fr/item/MOMA_1962__66_177190/