1. V.I. Afanasyev, J. Geiger, G. Kersting, V.A. Vatutin, Criticality for branching processes, 2005
2. V.I. Afanasyev, J. Geiger, G. Kersting, V.A. Vatutin, Branching processes in random environment, A phase transition in the subcritical regime. Available via: www.mathematik.uni-bielefeld.de/~trutnau/kersting.pdf
3. On branching processes with random environments, I and II : Extinction probability;Athreya;Ann. Math. Stat.,1971
4. Limit theorems for subcritical branching processes in random environment;Geiger;Ann. I. H. Poincaré,2003
5. On branching processes in random environments;Smith;Ann. Math. Stat.,1969