On the homogeneity of additive mappings.
On the orbits of hat-functions
On the recursive sequence .
On the regular solutions of a linear functional equation
On the solution of a functional equation F. Vajzović
On the Uniqueness of Solutions of the Functional Equation ... .
On the Uniqueness of the Representation of Functions in the Form ... .
On the Weierstrass functions, Sigma, Zeta, Pe, and their functional and differential equations.
On the Weierstrass functions, Sigma, Zeta, Pe, and their functional and differential equations. (Short Communication).
On Two Functional Equations Connected with a Mean-Value Property of Polynomials
On Two Functional Equations Connected with a Mean-Value Property of Polynomials (Short Communication)
On Uniqueness Theorems of Aczél and Cellular Internity of Miller (Short Communication)
On Uniqueness Theorems of Aczél and Cellular Internity of Miller
Orbit properties of functions and "Pre-Abel'' equations
Oscillation and global attractivity in a nonlinear delay difference equation