@article{AM2_1974__11_136434,
     author = {Pl. Kannappan},
     title = {On a {Functional} {Equation} {Connected} with {Generalized} {Directed-Divergence.}},
     journal = {Aequationes mathematicae},
     pages = {51--56},
     publisher = {mathdoc},
     volume = {11},
     year = {1974},
     zbl = {0291.39009},
     url = {http://geodesic.mathdoc.fr/item/AM2_1974__11_136434/}
}