@misc{ELMA_1963__18_140782,
     title = {Mitteilung.},
     journal = {Elemente der Mathematik},
     pages = {144--144},
     publisher = {mathdoc},
     volume = {18},
     year = {1963},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1963__18_140782/}
}