@article{MZM_2005_78_2_a2,
     author = {G. V. Voskresenskaya},
     title = {Group {Extensions} and {Hall} {Polynomials}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {180--185},
     publisher = {mathdoc},
     volume = {78},
     number = {2},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2005_78_2_a2/}
}