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.
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The NGSS offer a detailed description of the key scientific ideas and practices that all students should learn by the time they graduate from high school. The standards are based largely on the 2011 National Research Council report A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas.