Biographical Memoirs: Volume 90
The following HTML text is provided to enhance online
readability. Many aspects of typography translate only awkwardly to HTML.
Please use the page image
as the authoritative form to ensure accuracy.
1959  Differential operators with the positive maximum property. Illinois J. Math. 3:182-186.
 The birth and death process as diffusion process. J. Math. Pure. Appl. 38:301-345.
1966  An Introduction to Probability Theory and Its Applications, vol. 2. New York: Wiley.
 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.