@article{GDZPPN002026570,
title = {Characterization of the Cosine. (Short Communications).},
journal = {Aequationes mathematicae},
volume = {8},
year = {1972},
pages = {312-312},
url = {http://dml.mathdoc.fr/item/GDZPPN002026570}
}
Sarkovski, A.N. Characterization of the Cosine. (Short Communications).. Aequationes mathematicae, Tome 8 (1972) p. 312. http://gdmltest.u-ga.fr/item/GDZPPN002026570/