Roska T,Chua L O.Cellular neural networks with nonlinear and delay-type templates[J].Int J Circuit Theory Appl,1992,20:469-481.

Forti M.On global asymptotic stability of a class of nonlinear system arising in neural networks theory[J].J Diferential Equations,1994,113:246-264.

Zhao W.Dynamics of Cohen-Grossberg neural network with variable coefcients and time-varying delays[J].Nonlinear Analysis,2007,3:1024-1037.

Wu W,Cui B T,Huang M.Global asymptolic stability of delayed Cohen-Grossberg neural networks[J].Chaos,Solitons and Fractals,2007,34:872-877.

Huang T W,Li C D,Chen G.Stability of Cohen-Grossberg neural networks with unbounded distributed delays[J].Chaos,Solitons and Fractals,2007,34:992-996.

Wang L,Zou X F.Exponential stability of Cohen-Grossberg neural network[J].Neural Networks,2002,15:415-422.

Wu W,Cui B T,Lou X Y.Some criteria for asymptotic stability of Cohen-Grossberg neural networks with time-varying delays[J].Neurocomputing,2007,70:1085-1088.

Park J H,Kwon O M,Lee S M.State estimation for neural networks of neutral-type with interval time-varying delay[J].Appl Math Comput,2008,1:217-223.

Park J H,Kwon O M,Lee S M.LMI optimization approach on stability for delayed neural networks of neutral-type[J].Appl Math Comput,2008,196:236-244.

Park J H,Park C H,Kwon O M,Lee S M.A new stability criterion for bidirectional associative memory neural networks of neutral-type[J].Appl Math Comput,2008,199:716-722.

Park J H,Kwon O M.Design of state estimator for neural networks of neutral-type[J].Appl Math Comput,2008,1:360-369.

Lee S M,Kwon O M,Park J H.A novel delay-dependent criterion for delayed neural networks of neutral-type[J].Phys Lett A,2010,374:1843-1848.

Salamon D.Contral and observation of neutral systems[M].Boston:Pitman Advaneed Pub Program,1984.

Bellen A,Guglielmi N,Ruehli A.Methods for linear systems of circuit delay diferential equations of neutral type[J].IEEE Transactions on Circuits and Systems I,1999 46:212-216.

Gui Z J,Ge W G,Yang X S.Periodic oscillation for a Hopfield neural networks with neutral delays[J].Phys Lett A,2007,364:267-273.

Petryshyn W V,Yu Z S.Existence theorems for higher order nonlinear periodic boundary value problems[J].Nonlinear Anal,1982,6(9):943-969.

Liu Z,Mao Y.Existence theorem for periodic solutions of higher order nonlinear diferential equations[J].J Math Anal Appl,1997,216:481-490.

Li Y K,Zhao L,Chen X R.Existence of periodic solutions for neutral type cellular neural networks with delays[J].Appl Math Modell,2012,36(3):1173-1183.

Lu S,Ge W.Existence of positive solutions for neutral logarithmic model with multiple delays[J].J Comput Appl Math,2004,166:371-383.

Yang X F,Liao X F.Global exponential periodicity of a class of neural networks with recent-history distributed delays[J].Chaos,Solitons and Fractals,2005,25(2):441-447.