@article{ADM_2003_1_a4,
     author = {O. V. Kulikova},
     title = {On intersections of normal subgroups in free groups},
     journal = {Algebra and discrete mathematics},
     pages = {36--67},
     publisher = {mathdoc},
     number = {1},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2003_1_a4/}
}