Park C. SQUARE ROOT AND 3RD ROOT FUNCTIONAL EQUATIONS IN C^*-ALGEBRAS:. J. Nonlinear Anal. Optim. [internet]. 2011 Dec. 21 [cited 2026 Sep. 2];2(1):27-34. available from: https://ph03.tci-thaijo.org/index.php/jnao/article/view/2611