1959 [1] Differential operators with the positive maximum property. Illinois J. Math. 3:182-186.

[2] The birth and death process as diffusion process. J. Math. Pure. Appl. 38:301-345.

1966 [1] An Introduction to Probability Theory and Its Applications, vol. 2. New York: Wiley.

[2] On the influence of natural selection on population size. Proc. Natl. Acad. Sci. U. S. A. 55:733-738.

1968 An extension of the law of the iterated logarithm to variables without variance. J. Math. Mech. 18:343-356.

1970 On the oscillations of the sums of independent random variables. Ann. Math. 91:402-418.



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