@article{10_4153_CMB_1989_038_2,
     author = {Sands, A. D.},
     title = {On invariant radicals},
     journal = {Canadian mathematical bulletin},
     pages = {255--256},
     year = {1989},
     volume = {32},
     number = {2},
     doi = {10.4153/CMB-1989-038-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1989-038-2/}
}