“Boundedness in Nonlinear Functional Difference Equations via Non-Negative Definite Lyapunov Functionals With Applications to Volterra Discrete Systems”. Nonlinear Studies 13, no. 1 (February 1, 2006). Accessed March 14, 2026. https://www.nonlinearstudies.com/index.php/nonlinear/article/view/248.