Geodesic
A Cosine Functional Equation with Restricted Argument. (Short Communication).
Aequationes mathematicae, Tome 11 (1974), p. 118.

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@article{AM2_1974__11_136445,
     author = {L.B. Etigson},
     title = {A {Cosine} {Functional} {Equation} with {Restricted} {Argument.} {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {118--118},
     publisher = {mathdoc},
     volume = {11},
     year = {1974},
     zbl = {0318.39006},
     url = {http://geodesic.mathdoc.fr/item/AM2_1974__11_136445/}
}
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L.B. Etigson. A Cosine Functional Equation with Restricted Argument. (Short Communication).. Aequationes mathematicae, Tome 11 (1974), p. 118. http://geodesic.mathdoc.fr/item/AM2_1974__11_136445/