@article{ADM_2007_3_a6,
     author = {M. De Falco and F. de Giovanni and C. Musella},
     title = {Groups whose non-normal subgroups have small commutator subgroup},
     journal = {Algebra and discrete mathematics},
     pages = {46--58},
     publisher = {mathdoc},
     number = {3},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2007_3_a6/}
}