TY - JOUR AU - T.D. HOWROYD TI - Some Existence Theorems for Functional Equations in Many Variables and the Characterization of Weighted Quasi-Arithmetic Means JO - Aequationes mathematicae PY - 1971 SP - 1 EP - 15 VL - 7 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AM2_1971__7_136216/ ID - AM2_1971__7_136216 ER -