@article{10_4153_CMB_1967_005_7,
     author = {Retherford, J. R.},
     title = {Some {Characterizations} of co and l1},
     journal = {Canadian mathematical bulletin},
     pages = {39--52},
     year = {1967},
     volume = {10},
     number = {1},
     doi = {10.4153/CMB-1967-005-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-005-7/}
}