@article{MASLO_1973_23_3_a12,
     author = {Fiby, Rudolf},
     title = {Leibniz {Rule}},
     journal = {Mathematica slovaca},
     pages = {290--292},
     year = {1973},
     volume = {23},
     number = {3},
     mrnumber = {0325728},
     zbl = {0267.18010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1973_23_3_a12/}
}