@article{AM2_1983__26_136984,
     author = {P.G. Laird and J. Mills},
     title = {On systems of linear functional equations.},
     journal = {Aequationes mathematicae},
     pages = {64--73},
     publisher = {mathdoc},
     volume = {26},
     year = {1983},
     zbl = {0533.39005},
     url = {http://geodesic.mathdoc.fr/item/AM2_1983__26_136984/}
}