@article{10_1017_S0017089500007060,
     author = {Nicholson, W. K. and Watters, J. F.},
     title = {Normal radicals and normal classes of modules},
     journal = {Glasgow mathematical journal},
     pages = {97--100},
     year = {1988},
     volume = {30},
     number = {1},
     doi = {10.1017/S0017089500007060},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500007060/}
}