@article{MOMA_1971__75_177549,
     author = {Peter Gerl},
     title = {\"Uber die {Anzahl} der {Darstellungen} von {Worten.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {205--214},
     publisher = {mathdoc},
     volume = {75},
     year = {1971},
     zbl = {0225.05008},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1971__75_177549/}
}