@article{AM2_1982__25_136973,
     author = {P.G. Laird and J. Mills},
     title = {On systems of linear functional equations. {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {312--313},
     year = {1982},
     volume = {25},
     url = {http://geodesic.mathdoc.fr/item/AM2_1982__25_136973/}
}