
                        Existence of extremal periodic solutions for first-order functional differential equations | 
                
| ( Volume 5 Issue 6,June 2018 ) OPEN ACCESS | 
| Author(s): | 
                        Jiao Wang | 
                
| Abstract: | 
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 In this paper, we study the existence of periodic extremal solutions for the first-order functional differential equations.  | 
                
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