@article{GDZPPN00204014X, title = {On products of additive functions (a third approach).}, journal = {Aequationes mathematicae}, volume = {45}, year = {1993}, pages = {281-284}, zbl = {0777.12001}, url = {http://dml.mathdoc.fr/item/GDZPPN00204014X} }
Halter-Koch, Franz. On products of additive functions (a third approach).. Aequationes mathematicae, Tome 45 (1993) pp. 281-284. http://gdmltest.u-ga.fr/item/GDZPPN00204014X/