Some sufficient conditions for exponential stability of linear neutral functional differential equations

In this paper, we give some sufficient conditions for exponential stability of linear neutral functional differential equations. The obtained results are extensions of the recent results in [D.Q. Cao, P. He, Stability criteria of linear neutral systems with a single delay, Appl. Math. Comput. 148 (2004) 135-143, D.Q. Cao, P. He, Sufficient conditions for stability of linear neutral systems with a single delay, Appl. Math. Lett. 17 (2004) 139-144], [G.-D. Hu, G.-D. Hu, X.F. Zou, Stability of linear neutral systems with multiple delays: boundary criteria, Appl. Math. Comput. 148 (2004) 707-715; J.H. Park, S. Won, A note on stability of neutral delay-differential systems, J. Franklin Inst. 336 (1999) 1-9] to linear neutral functional differential equations.