@article{AM2_1975__12_136496,
     author = {F.J. Papp},
     title = {The {Functional} {Equation} f(xy) = ff(x) xyff(y) in a {Partially} {Ordered}  {Monoid.} {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {116--116},
     year = {1975},
     volume = {12},
     url = {http://geodesic.mathdoc.fr/item/AM2_1975__12_136496/}
}