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@article{10_4064_ap_16_1_53_57, author = {M. Kuczma}, title = {On a characterization of the cosine}, journal = {Annales Polonici Mathematici}, pages = {53--57}, publisher = {mathdoc}, volume = {16}, number = {1}, year = {1964}, doi = {10.4064/ap-16-1-53-57}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-16-1-53-57/} }
M. Kuczma. On a characterization of the cosine. Annales Polonici Mathematici, Tome 16 (1964) no. 1, pp. 53-57. doi : 10.4064/ap-16-1-53-57. http://geodesic.mathdoc.fr/articles/10.4064/ap-16-1-53-57/
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