TY  - JOUR
AU  - PL. Kannappan
TI  - A  note on cosine functional equation for groups
JO  - Matematički vesnik
PY  - 1971
SP  - 317 
VL  - 23
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MV_1971_23_1_a38/
ID  - MV_1971_23_1_a38
ER  -