@article{DAN_1960_134_1_a6,
     author = {V. S. Zhuravskii},
     title = {On the group of abelian extensions of abelian groups},
     journal = {Doklady Akademii Nauk},
     pages = {29--32},
     publisher = {mathdoc},
     volume = {134},
     number = {1},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_134_1_a6/}
}