On continuous solutions of the Schröder equation
On differentiable solutions of the functional equation φ(f(x)) = g(x, φ(x)) for vector-valued functions
On Extending of Solutions of a Functional Equation. (Short Communication).
On Extending of Solutions of Functional Equations in a Single Variable
On extending solutions of a functional equation.
On Functions Defined by Iterations of Each Other.
On Functions Satisfying a Generalized Mean Value Equation.
On Lipschitzian solutions of a functional equation
On measures connected with the Cauchy equation.
On measures connected with the Cauchy equation. (Short Communication).
On Meromorphic Solutions of a Functional Equation of Ganapathy Iyer.
On meromorphic solutions of a functional equation of Kuczma and Smajdor. (Short Communication).
On meromorphic solutions of a functional equation of Kuczma and Smajdor.
On meromorphic solutions of certain functional equations.
On meromorphic solutions of certain functional equations. (Short Communication).
On Mikusiński-Pexider functional equation
On Mikusiński's functional equation
On operator valued solutions of d'Alembert's functional equation, II
On operator-valued solutions of d'Alembert's functional equation, I
On problems of B. Choczewski and M. Kuczma concerning an integral equation