Z. Hu, X. Chen, W. Ma, Analysis of an SIS Epidemic Model with Temporary Immunity and Nonlinear Incidence Rate, Chinese J. Eng. Math. , 26(3)(2009), 407-415.
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- H. Shi, W. Ma, Z. Duan, Global asymptotic stability of a nonlinear time-delayed system of T cells in the thymus, Nonl. Anal. TMA, 71 (2009), 2699-2707.
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- W. Ma, Y. Saito, Y. Takeuchi, M-matrix structure and harmless delays in a Hopfield-type neural network, Appl. Math. Letters, 22 (2009), 1066-1070.
