中国科学院数学与系统科学研究院期刊网
Periodic Solutions of Neutral Higher Dimensional Periodic Differential System with Infinite Delay
Yong Zhen HU, Li Geng SI
Acta Mathematica Sinica, Chinese Series . 2005, (2): 235 -244 .  DOI: 10.12386/A2005sxxb0027