@article{AM2_1979__19_136834,
     author = {T.M.K. Davison},
     title = {A functional equation for quadratic forms {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {305--306},
     publisher = {mathdoc},
     volume = {19},
     year = {1979},
     url = {http://geodesic.mathdoc.fr/item/AM2_1979__19_136834/}
}