%0 Journal Article %A Qi, Aiqin %A Liu, Yansheng %T Monotone iterative techniques and a periodic boundary value problem for first-order differential equations with a functional argument. %J Georgian Mathematical Journal %D 2000 %P 373-378 %V 7 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/GMJ_2000__7_2_48669/ %G en %F GMJ_2000__7_2_48669