This code has many dependencies, where copyrights are described in
their respective packages.

Intenrally the folloiwng copyrights are held:

* Sylvan Elhay, Jaroslav Kautsky. John Burkardt for their Gauss 
  quadrature routines which is released under the GPL licence

* The copyright is for the slice sampling algorihm is held by the
  nlmixr team.  However, we the algorithm is described by Neal,
  RM. <https://projecteuclid.org/download/pdf_1/euclid.aos/1056562461>

* Emmanuelle Comets, Audrey Lavenu, Marc Lavielle for SAEM algorithm
  and their SAEMIX package, which was released under the GPL.  The
  code in this routine is written by Wenping Wang and relased under the GPL

The code is distributed under the GPL version 2 or greater.
