%0 Journal Article %A Abdelouaheb Ardjouni %A Ahcene Djoudi %T Existence of positive periodic solutions for third-order nonlinear delay differential equations with variable coefficients %J Mathematica Moravica %D 2019 %P 17 - 28 %V 23 %N 2 %I mathdoc %U https://geodesic-test.mathdoc.fr/item/MM3_2019_23_2_a1/ %F MM3_2019_23_2_a1