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2. Athreya, K. B. (2006) On the last common ancestor problem in branching processes, unpublished.
3. Athreya, K. B. (2009) Applications of size biasing in branching processes, Int. Symp. on Probability Theory & Stochastic processes, Cochin University, India, Feb 2009.
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5. Feller, W. (1968) An Introduction of Probability Theory and Its Applications, Wiley, NY.