@article{CMH_1946__19_138899,
     author = {Waclaw Sierpinski},
     title = {Sur la congruence des ensembles de points et ses g\'en\'eralisations.},
     journal = {Commentarii mathematici Helvetici},
     pages = {215--226},
     publisher = {mathdoc},
     volume = {19},
     year = {1946},
     zbl = {0063.07019},
     url = {http://geodesic.mathdoc.fr/item/CMH_1946__19_138899/}
}