@article{PFMT_2014_2_a9,
     author = {V. A. Kovaleva and Xiaolan Yi},
     title = {Finite groups with all $n$-maximal ($n = 2, 3$) subgroups $K$-$\mathfrak{U}$-subnormal},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {59--63},
     publisher = {mathdoc},
     number = {2},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2014_2_a9/}
}