@article{10_4153_CJM_1973_105_3,
     author = {Calder, J. R. and Coleman, W. P. and Harris, R. L.},
     title = {Centers of {Infinite} {Bounded} {Sets} in a {Normed} {Space}},
     journal = {Canadian journal of mathematics},
     pages = {986--999},
     year = {1973},
     volume = {25},
     number = {5},
     doi = {10.4153/CJM-1973-105-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1973-105-3/}
}