Geodesic
A note on cosine functional equation for groups
Matematički vesnik, Tome 23 (1971) no. 1, p. 317

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Classification : 39B52 
PL. Kannappan. A  note on cosine functional equation for groups. Matematički vesnik, Tome 23 (1971) no. 1, p. 317 . http://geodesic.mathdoc.fr/item/MV_1971_23_1_a38/
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     author = {PL. Kannappan},
     title = {A  note on cosine functional equation for groups},
     journal = {Matemati\v{c}ki vesnik},
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     year = {1971},
     volume = {23},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/MV_1971_23_1_a38/}
}
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