@article{AM2_1989__38_1_137312,
     author = {Margherita Fochi},
     title = {Functional equations on {A-orthogonal} vectors.},
     journal = {Aequationes mathematicae},
     pages = {28--40},
     publisher = {mathdoc},
     volume = {38},
     number = {1},
     year = {1989},
     zbl = {0679.39006},
     url = {http://geodesic.mathdoc.fr/item/AM2_1989__38_1_137312/}
}