@article{ADM_2016_22_1_a3,
     author = {Maryna G. Drushlyak and Tetyana D. Lukashova and Fedir M. Lyman},
     title = {Generalized norms of groups},
     journal = {Algebra and discrete mathematics},
     pages = {48--81},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2016_22_1_a3/}
}