@article{DM_1999_11_4_a2,
     author = {V. I. Afanasyev},
     title = {On the time of reaching a fixed level by a critical branching process in a random environment},
     journal = {Diskretnaya Matematika},
     pages = {33--47},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1999_11_4_a2/}
}