@article{10_1017_S0017089503001502,
     author = {DING, CHANGMING},
     title = {BOUNDED {ORBITS} {OF} {POSITIVELY} {BOUNDED} {SYSTEMS}},
     journal = {Glasgow mathematical journal},
     pages = {37--45},
     year = {2004},
     volume = {46},
     number = {1},
     doi = {10.1017/S0017089503001502},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089503001502/}
}