%0 Journal Article %A Zhonghuai Wu %A Jianying Shao %A Mingquan Yang %A Wei Gao %T Permanence and global exponential stability of Nicholson-type delay systems %J Annales Polonici Mathematici %D 2011 %P 205-211 %V 102 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap102-3-1/ %R 10.4064/ap102-3-1 %G en %F 10_4064_ap102_3_1