@article{GDZPPN002041588,
title = {Conditional function equations and orthogonal additivity.},
journal = {Aequationes mathematicae},
volume = {49},
year = {1995},
pages = {135-142},
zbl = {0876.39008},
url = {http://dml.mathdoc.fr/item/GDZPPN002041588}
}
Rätz, Jürg; Paganoni, Luigi. Conditional function equations and orthogonal additivity.. Aequationes mathematicae, Tome 49 (1995) pp. 135-142. http://gdmltest.u-ga.fr/item/GDZPPN002041588/