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[51] G. Fu, W. Ma and S. Ruan, Qualitative analysis of a Chemostat model with inhibitory exponential substrate uptake, Chaos, Solitons and Fractals., 23(2005), 873-886..
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[52] W. Ma, M. Song and Y. Takeuchi, Global stability of an SIR epidemic model with time delay, Appl. Math. Letters, 17(2004),1141-1145..
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[53] M. Yamaguchi, Y. Takeuchi and W. Ma, Population dynamics of sea bass and young sea bass, Discrete Contin. Dyn. Syst.-B, 4(2004), 833-840..
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[54] W. Ma and Y. Takeuchi, Asymptotic properties of a delayed SIR epidemic model with density dependent birth rate, Discrete Contin. Dyn. Syst.-B, 4(2004), 671-678..
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[55] T. Amemiya and W. Ma, Global asymptotic stability of nonlinear delayed systems of neutral type, Nonl. Anal. TMA, 54(2003), 83-91..
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[56] W. Ma, Y. Takeuchi, T. Hara and E. Beretta, Permanence of an SIR epidemic model with distributed time delays, Tohoku Math. J., 54(2002), 581-591..
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[57] 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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[58] 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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[59] 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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[60] W. Ma, T. Hara and Y. Takeuchi, Stability of a 2-dimensional neural network with time delays, J. Biol. Syst., 8(2000), 177-193..
