@article{AM2_1987__33_137198,
     author = {Konrad J. Heuvers and Daniel Moak},
     title = {Matrix solutions of the functional equation of the gamma function.},
     journal = {Aequationes mathematicae},
     pages = {1--17},
     year = {1987},
     volume = {33},
     zbl = {0625.39011},
     url = {http://geodesic.mathdoc.fr/item/AM2_1987__33_137198/}
}