“Boundedness in Nonlinear Functional Difference Equations via Non-negative Definite Lyapunov Functionals with Applications to Volterra Discrete Systems”, NS, vol. 13, no. 1, Feb. 2006, Accessed: Mar. 01, 2026. [Online]. Available: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/248