@article{GDZPPN002026880,
title = {Characterization of the Cosine (Russisch)},
journal = {Aequationes mathematicae},
volume = {9},
year = {1973},
pages = {121-128},
url = {http://dml.mathdoc.fr/item/GDZPPN002026880}
}
SARKOVSKII, A.N. Characterization of the Cosine (Russisch). Aequationes mathematicae, Tome 9 (1973) pp. 121-128. http://gdmltest.u-ga.fr/item/GDZPPN002026880/