@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/