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@article{AM2_1973__9_136337, author = {A.N. SARKOVSKII}, title = {Characterization of the {Cosine} {(Russisch)}}, journal = {Aequationes mathematicae}, pages = {121--128}, publisher = {mathdoc}, volume = {9}, year = {1973}, url = {http://geodesic.mathdoc.fr/item/AM2_1973__9_136337/} }
A.N. SARKOVSKII. Characterization of the Cosine (Russisch). Aequationes mathematicae, Tome 9 (1973), pp. 121-128. http://geodesic.mathdoc.fr/item/AM2_1973__9_136337/