6.1.  &ndash;Hastings and Peacock, Statistical
     Distributions&ndash;A Handbook for Students and Practitioners, 1975,
     pages 108-113.</li>
<li>National Bureau of Standards Applied Mathematics Series 55, 1964,
     page 929.  &ndash;Feller, An Introduction to Probability Theory and Its
     Applications, Volume 1, Edition 2, 1957, pages 146-154.</li>
<li>Cox and Miller, The Theory of Stochastic Processes, 1965, page 7.</li>
<li>General Electric Company, Tables of the Individual and Cumulative
     Ter