@article{ELMA_1964__19_140785,
     author = {W. Sierpinski},
     title = {Sur une propri\'et\'e des nombres naturels.},
     journal = {Elemente der Mathematik},
     pages = {27--29},
     publisher = {mathdoc},
     volume = {19},
     year = {1964},
     zbl = {0118.04908},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1964__19_140785/}
}