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- [45] ON THE SOLUTIONS OF THE FUNCTIONAL-EQUATION - F(F(Y)(K)X + F(X)(L)Y) = LAMBDA-F(X)F(Y) PUBLICATIONES MATHEMATICAE-DEBRECEN, 1992, 41 (3-4): : 213 - 223
- [48] ON THE FUNCTIONAL-EQUATION F(X1)+F(X2)=F(Y1)+F(Y2) PERIODICA POLYTECHNICA-ELECTRICAL ENGINEERING, 1981, 25 (02): : 115 - 122