@article{PMF_1917_28_1_a3,
     author = {Mazurkiewicz, Stefan},
     title = {O pierwszej pochodnej uog\'olnionej},
     journal = {Prace Matematyczno-Fizyczne},
     pages = {79--85},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {1917},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/PMF_1917_28_1_a3/}
}