@article{AM2_1978__18_136782,
     author = {M.J. Frank},
     title = {On the simultaneous associativity of {F(x,} y) and {x+y-F(x,} y). {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {266--268},
     publisher = {mathdoc},
     volume = {18},
     year = {1978},
     url = {http://geodesic.mathdoc.fr/item/AM2_1978__18_136782/}
}