@article{MOMA_1982__94_178096,
     author = {Gilbert Helmberg},
     title = {Die {Entropie} einer linear gebrochenen {Funktion.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {213--248},
     publisher = {mathdoc},
     volume = {94},
     year = {1982},
     zbl = {0485.54011},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1982__94_178096/}
}