On the stability of the quadratic mapping in normed spaces.
On the stability of generalized gamma functional equation.
On the superstability of the Pexider type trigonometric functional equation.
Superstability of some Pexider-type functional equation.
Stability of the Lobacevski equation.
A stability of the generalized sine functional equations. II.
On the stability of mixed trigonometric functional equations.
On the stability of trigonometric functional equations.
Hyers-Ulam stability of a bi-Jensen functional equation on a punctured domain.
On the stability of generalized d'Alembert and Jensen functional equations.
Notes on stability of the generalized gamma functional equation.
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