@article{GDZPPN002037815, title = {On a linear functional equation.}, journal = {Aequationes mathematicae}, volume = {38}, year = {1989}, pages = {113-122}, zbl = {0686.39012}, url = {http://dml.mathdoc.fr/item/GDZPPN002037815} }
Székelyhidi, László. On a linear functional equation.. Aequationes mathematicae, Tome 38 (1989) pp. 113-122. http://gdmltest.u-ga.fr/item/GDZPPN002037815/