@article{10_1017_S0017089500030585,
     author = {Harlander, Jens},
     title = {Minimal {Cockcroft} subgroups},
     journal = {Glasgow mathematical journal},
     pages = {87--90},
     year = {1994},
     volume = {36},
     number = {1},
     doi = {10.1017/S0017089500030585},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500030585/}
}