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.
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- 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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- W. Ma, T. Hara and Y. Takeuchi, Stability of a 2-dimensional neural network with time delays, J. Biol. Syst., 8(2000), 177-193.
