R-and T-Groupoids: A Generalization of Groups.
Random stability of an additive-quadratic-quartic functional equation.
Regular hexagons in normed spaces and a theorem of Walter Benz.
Regularity properties of functional equations.
Regularity properties of functional equations and inequalities.
Regularity properties of functional equations. (Short Communication).
Relations de dépendance entre les équations fonctionelles de Cauchy.
Remark on a paper of M. A. McKiernan
Remark on a paper of R. Dacić
Remarks on stability of functional equations.
Remarks on the stability of functional equations.
Répartition de Suites et Équations Fonctionnelles Associées.
Restricted homogeneity implies bi-additivity
Röhmel's equation for quadratic forms.
Roots and logarithms of automorphisms of complete local rings.
Roots, iterations and logarithms of formal automorphisms.
Roots of formal power series in one variable.