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@article{AM2_1972__8_136307, author = {A.N. Sarkovski}, title = {Characterization of the {Cosine.} {(Short} {Communications).}}, journal = {Aequationes mathematicae}, pages = {312--312}, publisher = {mathdoc}, volume = {8}, year = {1972}, url = {http://geodesic.mathdoc.fr/item/AM2_1972__8_136307/} }
A.N. Sarkovski. Characterization of the Cosine. (Short Communications).. Aequationes mathematicae, Tome 8 (1972), p. 312. http://geodesic.mathdoc.fr/item/AM2_1972__8_136307/