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- [2] FUNCTIONAL-EQUATION F(X)G(Y)=P(X+Y)Q(X/Y) NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1975, 22 (05): : A565 - A565
- [5] PROPERTIES OF SOLUTIONS OF LINEAR-DIFFERENTIAL EQUATION [P(X)Y'(X)]'+Q(X)Y(X)=F(X) ACTA UNIVERSITATIS AGRICULTURAE FACULTAS SILVICULTURAE, 1975, 44 (3-4): : 379 - 395
- [6] On the functional equation x + f(y + f(x)) = y + f(x + f(y)) Aequationes mathematicae, 2008, 75 : 297 - 303
- [7] On the functional equation x + f(y + f(x))=y + f(x + f(y)) Aequationes mathematicae, 2013, 86 : 187 - 200
- [9] BOUNDARY-VALUE PROBLEM FOR EQUATION Y' = LAMBDAF(X,Y) + H(X,Y) - G(X,Y)Y ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK, 1974, 54 (11): : 723 - 728