Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1969__19_4_a6, author = {Mi\v{s}{\'\i}k, Ladislav}, title = {Bemerkungen \"uber approximative {Ableitung}}, journal = {Mathematica slovaca}, pages = {283--291}, publisher = {mathdoc}, volume = {19}, number = {4}, year = {1969}, mrnumber = {0302834}, zbl = {0191.34503}, language = {ge}, url = {http://geodesic.mathdoc.fr/item/MASLO_1969__19_4_a6/} }
Mišík, Ladislav. Bemerkungen über approximative Ableitung. Mathematica slovaca, Tome 19 (1969) no. 4, pp. 283-291. http://geodesic.mathdoc.fr/item/MASLO_1969__19_4_a6/