%0 Journal Article %A Bingwen Liu %T Permanence for a delayed Nicholson's blowflies model with a nonlinear density-dependent mortality term %J Annales Polonici Mathematici %D 2011 %P 123-129 %V 101 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap101-2-2/ %R 10.4064/ap101-2-2 %G en %F 10_4064_ap101_2_2