@article{10_4064_cm_8_2_251_255,
     author = {J. Lipi\'nski},
     title = {Une simple d\'emonstration du th\'eor\`eme sur la d\'eriv\'e d'une fonction de sauts},
     journal = {Colloquium Mathematicum},
     pages = {251--255},
     publisher = {mathdoc},
     volume = {8},
     number = {2},
     year = {1961},
     doi = {10.4064/cm-8-2-251-255},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-8-2-251-255/}
}