@article{ELMA_1962__17_140742,
     author = {W. Sierpinski},
     title = {Sur une propri\'et\'e des nombres t\'etra\'edraux.},
     journal = {Elemente der Mathematik},
     pages = {29--30},
     publisher = {mathdoc},
     volume = {17},
     year = {1962},
     zbl = {0113.26903},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1962__17_140742/}
}