@article{10_4153_CJM_1968_025_8,
     author = {Grace, E. E.},
     title = {Peripheral {Covering} {Properties} {Imply} {Covering} {Properties}},
     journal = {Canadian journal of mathematics},
     pages = {257--263},
     year = {1968},
     volume = {20},
     number = {1},
     doi = {10.4153/CJM-1968-025-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-025-8/}
}