1. Billingsley, P.: Probability and Measure. New York: Wiley 1979
2. Bühler, W.: The distribution of generations and other aspects of the family structure of branching processes. Proc. Sixth Berkeley Sympos. Math. Statist. Probability Univ. California Press, Berkeley. Vol. 3, pp. 463 (1972)
3. Çinlar, E.: Introduction to Stochastic Processes. New York: Prentice-Hall 1975
4. Jagers, P.: Branching Processes with Biological Applications. London: Wiley 1975
5. Jagers, P.: How probable is it to be first-born? and other branching process applications to kinship problems. Math. Biosciences 59, 1?15 (1982)