期刊论文详细信息
Boundary value problems
Existence of periodic solutions for first-order delay differential equations via critical point theory
Lichun Chen1  Shao-Kang Zhang1 
[1] Department of Mathematics and Statistics, Zhaotong University, Zhaotong, P.R. China
关键词: weak linking;    linking;    periodic solution;    critical point;   
DOI  :  10.1186/1687-2770-2013-254
学科分类:数学(综合)
来源: SpringerOpen
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