@article{10_4153_CMB_1967_067_4,
     author = {Chalk, J.H.H.},
     title = {A {Note} on {Coverings} of {En} by {Convex} {Sets}},
     journal = {Canadian mathematical bulletin},
     pages = {669--673},
     year = {1967},
     volume = {10},
     number = {5},
     doi = {10.4153/CMB-1967-067-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-067-4/}
}