3Niculescu S I, De Souza C E, Dugard L, et al. Robust exponential stability of uncertain systems with time-varying delays[J]. IEEE Trans Auto Control,1998,43:743-748.
9Mori T,Fukuma N,Kuwahahraa M.Simple stability criteria for single and composite linear systems with delays[J].Int J Contr,1981,34:1175~1184.
10Niculescu S I,De Souza C E,Dugard L,et al.Robust exponential stability of uncertain systems with time-varying delays[J].IEEE Trans Auto Contr,1998,43:743~748.