Geodesic
Positive periodic solutions of impulsive functional differential equations with a parameter
Acta mathematica Universitatis Comenianae, Tome 80 (2011) no. 1 
Yanqin Wang; Qingwei Tu; Qiang Wang; Chao Hu. Positive periodic solutions of impulsive functional
differential equations with a parameter. Acta mathematica Universitatis Comenianae, Tome 80 (2011) no. 1. http://geodesic.mathdoc.fr/item/AMUC_2011_80_1_a1/
@article{AMUC_2011_80_1_a1,
     author = {Yanqin Wang and Qingwei Tu and Qiang Wang and Chao Hu},
     title = {Positive periodic solutions of impulsive functional
differential equations with a parameter},
     journal = {Acta mathematica Universitatis Comenianae},
     year = {2011},
     volume = {80},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/AMUC_2011_80_1_a1/}
}
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Voir la notice de l'article provenant de la source Comenius University

By using a fixed point theorem of strict-set-contraction, some criteria are established for the existence of positive periodic solutions of the following impulsive functional differential equations with a parameter