Y. Saito, W. Ma and T. Hara, Necessary and sufficient conditions for permanence of a Lotka - Volterra discrete systems with delays, J. Math. Anal. Appl., 256(2001), 162-174.
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- Y. Saito, T. Hara and W. Ma, Harmless delays for permanence and impersistence of a Lotka - Volterra discrete predator-prey system, Nonl. Anal. TMA, 50(2002), 705-715.
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- E. Beretta, T. Hara, W. Ma and Y. Takeuchi, Global asymptotic stability of an SIR epidemic models with distributed time delay, Nonl. Anal. TMA, 47(2001), 4107-4115.
