@article{AM2_1968__1_135949,
     author = {Akinori Nishiyama and Soichi Horinouchi},
     title = {On a {System} of {Functional} {Equations.} {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {192--193},
     year = {1968},
     volume = {1},
     url = {http://geodesic.mathdoc.fr/item/AM2_1968__1_135949/}
}