@article{ELMA_1972__27_141065,
     author = {A. Rotkiewicz},
     title = {On a {Problem} of {W.} {Sierpinski.}},
     journal = {Elemente der Mathematik},
     pages = {83--85},
     publisher = {mathdoc},
     volume = {27},
     year = {1972},
     zbl = {0249.10013},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1972__27_141065/}
}