1. T. E. Harris, The Theory of Branching Processes, Springer-Verlag, Berlin-Göttingen-Heidelberg (1966).
2. R. Otter, ?The multiplicative process,? Ann. Math. Stat.,20, No. 2, 206?224 (1949).
3. E. T. Whittaker and G. N. Watson, A Course of Modern Analysis, Cambridge University Press, London (1963).
4. B. V. Gnedenko and A. N. Kolmogorov, Limit Distributions for Sums of Independent Random Variables [in Russian], Moscow (1949).
5. V. V. Petrov, ?Local limit theorems for sums of independent random variables,? Teoriya Veroyat. i ee Primen.,9, No. 2, 343?352 (1964).