Equivalence of 'Cube' and 'Octahedron' Functional Equations (Short Communication) LAWRENCE ETIGSON — 1973 Aequationes mathematicae
Equivalence of 'Cube' and 'Octahedron' Functional Equations. Lawrence Etigson — 1974 Aequationes mathematicae
A Functional Inequality for Entire Functions Generalizing the Sine Functional Equation. (Short Communication). Lawrence Etigson — 1974 Aequationes mathematicae