Generalised Hyers-Ulam Product-Sum Stability of a Cauchy Type Additive Functional Equation. Eur. J. Pure Appl. Math. [Internet]. 2011 Jan. 30 [cited 2024 Nov. 24];4(1):50-8. Available from: https://www.ejpam.com/index.php/ejpam/article/view/677