中国科学院数学与系统科学研究院期刊网
On the Existence and Uniqueness of Almost Periodic Solutions of Some Retarded System
Chun Hua FENG(1),Chang Xiang Y
Acta Mathematica Sinica, Chinese Series . 2001, (5): 917 -922 .  DOI: 10.12386/A2001sxxb0117