@article{GDZPPN002039397, title = {On Jensen's functional equation.}, journal = {Aequationes mathematicae}, volume = {44}, year = {1992}, pages = {211-218}, zbl = {0755.39008}, url = {http://dml.mathdoc.fr/item/GDZPPN002039397} }
Vasudeva, H.L.; Parnami, J.C. On Jensen's functional equation.. Aequationes mathematicae, Tome 44 (1992) pp. 211-218. http://gdmltest.u-ga.fr/item/GDZPPN002039397/