@article{10_14708_am_v7i0_583,
     author = {W{\l}adys{\l}aw Wilczy\'nski},
     title = {Zygmunt {Zahorski's} works on the first derivative},
     journal = {Antiquitates Mathematicae},
     pages = { 247--252},
     publisher = {mathdoc},
     volume = {7},
     year = {2013},
     doi = {10.14708/am.v7i0.583},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/am.v7i0.583/}
}