On Parallelogram Functional Equations.
On the Functional Equation f (x + t, y) + f (x - t, y) = f (x, y + t) + f (x, y - t).
On a 'Cube Functional Equation'.
On an Application of the 'Square' Functional Equation to a Geometrie Characterization of Quadratic Functions from the Standpoint of Conformal-Mapping Properties
On an Application of the 'Square' Functional Equation to a Geometric Characterization of Quadratic Functions form the Standpoint of Conformal-Mapping Properties. (Short Communication).
On a functional equation for Jacobi's elliptic function cn(z; k).
On a functional equation of Pexider type.
A proof of Euler's identity by a functional equation.
A new functional equation characterizing generalized Joukowski transformations.
On a generalization of Hille's functional equation
On a conformal-mapping property
On a theorem of inversive geometry
On the equivalence of Hille's and Robinson's functional equations
A functional equation arising from the Joukowski transformation
On entire functions which transform straight lines into parabolas
An equivalent property to Ivory's theorem from the standpoint of conformal mapping
A characteristic property of orthogonal pencils of coaxal circles from the standpoint of conformal mapping
On a metrical theorem in geometry of circles
A functional equation connected with the sine addition theorem
A generalization of Hille's and Robinson's functional equations
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