Some Existence Theorems for Functional Equations in Many Variables and the Characterization of Weighted Quasi-Arithmetic Means (Short Communication) T.D. HOWROYD — 1971 Aequationes mathematicae
On the Equivalence of a Functional Equation in n Variables with n Functional Equations in a Single Variable. (Short Communication). T.D. Howroyd — 1969 Aequationes mathematicae
On the Equivalence of a Functional Equation in n Variables with n Functional Equations in a Single Variable. T.D. Howroyd — 1970 Aequationes mathematicae
Some Existence Theorems for Functional Equations in Many Variables and the Characterization of Weighted Quasi-Arithmetic Means T.D. HOWROYD — 1971 Aequationes mathematicae