@article{10_4153_CMB_1989_022_2,
     author = {Grubb, D. J.},
     title = {U-Sets in {Compact,} {0-Dimensional,} {Metric} {Groups}},
     journal = {Canadian mathematical bulletin},
     pages = {149--155},
     year = {1989},
     volume = {32},
     number = {2},
     doi = {10.4153/CMB-1989-022-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1989-022-2/}
}