@article{GDZPPN002038021,
title = {Jensen's functional equation on groups.},
journal = {Aequationes mathematicae},
volume = {40},
year = {1990},
pages = {85-99},
zbl = {0688.39007},
url = {http://dml.mathdoc.fr/item/GDZPPN002038021}
}
Ng, C.T. Jensen's functional equation on groups.. Aequationes mathematicae, Tome 40 (1990) pp. 85-99. http://gdmltest.u-ga.fr/item/GDZPPN002038021/