@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/}
}