@article{10_1017_S0017089512000821,
     author = {LONGOBARDI, PATRIZIA and MAJ, MERCEDE and ROBINSON, DEREK J. S. and SMITH, HOWARD},
     title = {ON {GROUPS} {WITH} {TWO} {ISOMORPHISM} {CLASSES} {OF} {DERIVED} {SUBGROUPS}},
     journal = {Glasgow mathematical journal},
     pages = {655--668},
     year = {2013},
     volume = {55},
     number = {3},
     doi = {10.1017/S0017089512000821},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089512000821/}
}