%0 Journal Article %A Ding, Yanhui %A Chen, Min %T Positive and negative solutions of impulsive functional differential equations %J Journal of nonlinear sciences and its applications %D 2017 %P 922-928 %V 10 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.22436/jnsa.010.03.05/ %R 10.22436/jnsa.010.03.05 %G en %F JNSA_2017_10_3_a4