Gs to provide other kinds of random
numbers. 
</dl>
<p>By default, the Integer RNG used is a faithful adaptation of
the Mersenne Twister MT19937 <!-- BZINDEX MersenneTwister --> due to<a name="index00439">
Matsumoto and Nishimura (see ACM Transactions on Modeling
and Computer Simulation, Vol. 8, No. 1, January 1998, pp 3-30,
<a href="http://www.math.keio.ac.jp/~matumoto/emt.html">web page</a>,
<a href="http://www.acm.org/pubs/citations/journals/tomacs/1998-8-1/p3-matsumoto/">paper</a>).
This generator has a