%0 Journal Article %A Haruki, Hiroshi %T On a functional equation for the exponential function of a complex variable %J Glasgow mathematical journal %D 1971 %P 31-34 %V 12 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500001117/ %R 10.1017/S0017089500001117 %F 10_1017_S0017089500001117