@article{GDZPPN002022656,
title = {\"Uber die Funktionalgleichung f (1 + x) + f (1 + f (x)) = 1. (Short Communication).},
journal = {Aequationes mathematicae},
volume = {1},
year = {1968},
pages = {316-317},
zbl = {0165.17201},
url = {http://dml.mathdoc.fr/item/GDZPPN002022656}
}
Benz, W.; Elliger, S. Über die Funktionalgleichung f (1 + x) + f (1 + f (x)) = 1. (Short Communication).. Aequationes mathematicae, Tome 1 (1968) pp. 316-317. http://gdmltest.u-ga.fr/item/GDZPPN002022656/