中国科学院数学与系统科学研究院期刊网
AMS
On the Existence, Uniqueness and Stability of Periodic Solutions of Large Scale Systems with Unbounded Delay
Wang Lian, Wang Muqiu, Li Liming
Acta Mathematica Sinica . 1994, (1): 88 -98 .  DOI: 10.1007/BF02561552