@article{RM_1960_15_3_a16,
     author = {A. G. Kurosh},
     title = {Free sums of multi-operator groups and algebras},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_3_a16/}
}