@article{MOMA_1981__91_178019,
     author = {P. Kirschenhofer and G. Baron},
     title = {Operatorenkalk\"ul \"uber freien {Monoiden} {II:} {Binominalsysteme.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {181--196},
     publisher = {mathdoc},
     volume = {91},
     year = {1981},
     zbl = {0448.05005},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1981__91_178019/}
}