@article{10_1017_S0017089500002688,
     author = {Liebeck, Hans},
     title = {A test for commutators},
     journal = {Glasgow mathematical journal},
     pages = {31--36},
     year = {1976},
     volume = {17},
     number = {1},
     doi = {10.1017/S0017089500002688},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002688/}
}