%0 Journal Article %A Martin-Gutierrez, Emma %T On a Conditional Cauchy-type Functional Equation Involving Powers %J Serdica Mathematical Journal %D 1999 %P 5-10 %V 25 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SMJ2_1999_25_1_a1/ %G en %F SMJ2_1999_25_1_a1