@article{10_4064_sm192_1_2,
     author = {Lixin Cheng and Qingjin Cheng and Huihua Shi},
     title = {Minimal ball-coverings in {Banach} spaces and their application},
     journal = {Studia Mathematica},
     pages = {15--27},
     year = {2009},
     volume = {192},
     number = {1},
     doi = {10.4064/sm192-1-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm192-1-2/}
}