@article{AM2_1985__29_137102,
     author = {Peter Volkmann and Lutz Volkmann},
     title = {Sur la caract\'erisation de la fonction f(x) = x par des \'equations fonctionnelles, {II.} {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {315--316},
     publisher = {mathdoc},
     volume = {29},
     year = {1985},
     url = {http://geodesic.mathdoc.fr/item/AM2_1985__29_137102/}
}