@article{10_1017_S204061850003447X,
     author = {Macdonald, I. D.},
     title = {On a set of normal subgroups},
     journal = {Glasgow mathematical journal},
     pages = {137--146},
     year = {1962},
     volume = {5},
     number = {3},
     doi = {10.1017/S204061850003447X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S204061850003447X/}
}