9Liao X X,Fu Y L,Xie S L.Globally exponential stability of Hopfield networks[J].Adv.Syst.Sci.Appl.,2005,5:533-545.
10Cohen M A,Grossberg S.Absolute stability of global pattern formation and parallel memory storage by competitive neural networks[J].IEEE Trans.Syst.Man and Cyber,1983,13:815-826.