TY  - JOUR
AU  - Etigson, L. B.
TI  - A Cosine Functional Equation with Restricted Argument
JO  - Canadian mathematical bulletin
PY  - 1974
SP  - 505
EP  - 509
VL  - 17
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-089-x/
DO  - 10.4153/CMB-1974-089-x
ID  - 10_4153_CMB_1974_089_x
ER  -