@article{10_1017_S0017089500032031,
     author = {Smith, Howard},
     title = {Groups with few non-nilpotent subgroups},
     journal = {Glasgow mathematical journal},
     pages = {141--151},
     year = {1997},
     volume = {39},
     number = {2},
     doi = {10.1017/S0017089500032031},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500032031/}
}