@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/}
}