@article{MOMA_1966__70_177334,
     author = {Gilbert Helmberg},
     title = {\"Uber endliche invariante {Ma{\ss}e} auf {Untermengen.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {229--232},
     publisher = {mathdoc},
     volume = {70},
     year = {1966},
     zbl = {0192.14303},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1966__70_177334/}
}