@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/