@article{ADM_2010_9_1_a6,
     author = {Francesco G. Russo},
     title = {A generalization of groups with many almost normal subgroups},
     journal = {Algebra and discrete mathematics},
     pages = {79--85},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2010_9_1_a6/}
}