@article{KUMEM_1927_2_a22,
     author = {W. Sierpi\'nski},
     title = {Sur une fonction de classe~4},
     journal = {In memoriam N. I. Lobatschevskii},
     pages = {197--201},
     publisher = {mathdoc},
     volume = {2},
     year = {1927},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/KUMEM_1927_2_a22/}
}