%0 Journal Article %A Xu, Changjin %A Zhang, Qianhong %A Liao, Maoxin %T Existence and global attractivity of positive periodic solutions for a delayed competitive system with the effect of toxic substances and impulses %J Applications of Mathematics %D 2013 %P 309-328 %V 58 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.1007/s10492-013-0015-5/ %R 10.1007/s10492-013-0015-5 %G en %F 10_1007_s10492_013_0015_5