Some Existence Theorems for Functional Equations in Many Variables and the Characterization of Weighted Quasi-Arithmetic Means
Aequationes mathematicae, Tome 7 (1971), pp. 1-15.

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@article{AM2_1971__7_136216,
     author = {T.D. HOWROYD},
     title = {Some {Existence} {Theorems} for {Functional} {Equations} in {Many} {Variables} and the {Characterization} of {Weighted} {Quasi-Arithmetic} {Means}},
     journal = {Aequationes mathematicae},
     pages = {1--15},
     publisher = {mathdoc},
     volume = {7},
     year = {1971},
     zbl = {0236.39009},
     url = {http://geodesic.mathdoc.fr/item/AM2_1971__7_136216/}
}
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T.D. HOWROYD. Some Existence Theorems for Functional Equations in Many Variables and the Characterization of Weighted Quasi-Arithmetic Means. Aequationes mathematicae, Tome 7 (1971), pp. 1-15. http://geodesic.mathdoc.fr/item/AM2_1971__7_136216/