@article{10_4153_CMB_1958_004_1,
     author = {Robinson, G. de B.},
     title = {A {Remark} by {Philip} {Hall}},
     journal = {Canadian mathematical bulletin},
     pages = {21--23},
     year = {1958},
     volume = {1},
     number = {1},
     doi = {10.4153/CMB-1958-004-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1958-004-1/}
}