期刊：Journal of Applied Mathematics and Mechanics
卷册：Volume 41, Issue 5
年份：1 September 2004
页码：Pages 2319-2325
篇名：The existence of positive periodic solutions for periodic feedback control systems with delays
作者：G. Fan
链接:
http://onlinelibrary.wiley.com/doi/10.1002/zamm.200310104/abstract