TY - JOUR AU - M.J. Frank TI - On the simultaneous associativity of F(x, y) and x+y-F(x, y). (Short Communication). JO - Aequationes mathematicae PY - 1978 SP - 266 EP - 268 VL - 18 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AM2_1978__18_136782/ ID - AM2_1978__18_136782 ER -