Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1972__22_2_a1, author = {Mi\v{s}{\'\i}k, Ladislav}, title = {Notes on an approximate derivative}, journal = {Mathematica slovaca}, pages = {108--114}, publisher = {mathdoc}, volume = {22}, number = {2}, year = {1972}, mrnumber = {0315057}, zbl = {0236.26002}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1972__22_2_a1/} }
Mišík, Ladislav. Notes on an approximate derivative. Mathematica slovaca, Tome 22 (1972) no. 2, pp. 108-114. http://geodesic.mathdoc.fr/item/MASLO_1972__22_2_a1/