1. Billingsley, P., 1995. Probability and Measure, 3rd Edition. Wiley, New York.
2. Çinlar, E., 1972. Superposition of point processes. In: Lewis, P.A.W. (Ed.), Stochastic Point Processes. Wiley, New York, pp. 549–606.
3. Characterization of geometric and exponential distributions;Crawford;Ann. Math. Stat.,1966
4. Poisson and alternating renewal processes with superposition a renewal process;Daley;Math. Nachr.,1973
5. Daley, D.J., Vere-Jones, D., 1988. An Introduction to the Theory of Point Processes. Springer, Berlin.