@article{DAN_1969_186_4_a12,
     author = {B. N. Petrov and G. A. Stepanyantz},
     title = {A contribution to the theory of branching systems},
     journal = {Doklady Akademii Nauk},
     pages = {783--786},
     publisher = {mathdoc},
     volume = {186},
     number = {4},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_186_4_a12/}
}