@article{SM_2021_212_1_a0,
     author = {V. A. Vatutin and E. E. Dyakonova and V. A. Topchii},
     title = {Critical {Galton-Watson} branching processes with a~countable set of types and infinite second moments},
     journal = {Sbornik. Mathematics},
     pages = {1--24},
     publisher = {mathdoc},
     volume = {212},
     number = {1},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2021_212_1_a0/}
}