@article{ELMA_1961__16_140734,
     author = {E. H\"artter},
     title = {\"Uber die {Verallgemeinerung} eines {Satzes} von {Sierpinski.}},
     journal = {Elemente der Mathematik},
     pages = {123--127},
     publisher = {mathdoc},
     volume = {16},
     year = {1961},
     zbl = {0104.03604},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1961__16_140734/}
}