Most of the existing results on global stability of delayed nonautonomous Lotka-Volterra type systems require that such systems have saturated equilibria, which is rather unnatural. In this paper, using a Lyapunov function, we obtain global stability results for such systems even if they have no saturated equilibria.
Yang Kuang. "Global stability in delayed nonautonomous Lotka-Volterra type systems without saturated equilibria." Differential Integral Equations 9 (3) 557 - 567, 1996. https://doi.org/10.57262/die/1367969971