Zhang, Yi et Wang, Meijuan, Two families of liapunov functions for functional differential systems, Acta mathematica Sinica. English series (Print) , 15(2), 1999, pp. 197-206
Two families of Liapunov functions are employed to study the global stability and boundedness of functional differential systems. New stability and boundedness theorems are obtained. Applications of these theorems to some nonlinear differential systems with infinite delay are discussed.