%0 Journal Article %A DING, CHANGMING %T BOUNDED ORBITS OF POSITIVELY BOUNDED SYSTEMS %J Glasgow mathematical journal %D 2004 %P 37-45 %V 46 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089503001502/ %R 10.1017/S0017089503001502 %F 10_1017_S0017089503001502