@article{10_1017_S0017089500030615,
     author = {Smith, Howard},
     title = {On the normal cores of certain subgroups of nilpotent groups},
     journal = {Glasgow mathematical journal},
     pages = {113--115},
     year = {1994},
     volume = {36},
     number = {1},
     doi = {10.1017/S0017089500030615},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500030615/}
}