@article{10_4153_CJM_1978_081_1,
     author = {Faber, V. and Laver, R. and McKenzie, R.},
     title = {Coverings of {Groups} by {Abelian} {Subgroups}},
     journal = {Canadian journal of mathematics},
     pages = {933--945},
     year = {1978},
     volume = {30},
     number = {5},
     doi = {10.4153/CJM-1978-081-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1978-081-1/}
}