The excursions package contains a small subset of GSL.
The specific authorships and copyrights are detailed in
src/gsl_fix.c
src/gsl_fix.h

GSL - GNU Scientific Library
============================

This is GSL, the GNU Scientific Library, a collection of numerical
routines for scientific computing.

GSL is free software, you can redistribute it and/or modify it under
the terms of the GNU General Public License.

The GNU General Public License does not permit this software to be
redistributed in proprietary programs.

This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

More information about GSL
==========================

The project homepage is http://www.gnu.org/software/gsl/

See the NEWS file for recent changes to the library.

The GSL Manual has been published and can be ordered from most
bookstores. The publication details are,

  GNU Scientific Library Reference Manual - Revised Second Edition, 
  M. Galassi et al, ISBN 0954161734 (620 pages, paperback).

The money raised from sales of the manual helps support the
development of GSL.

A Japanese translation of the reference manual is available from the
GSL website above (thanks to Daisuke TOMINAGA).

Authors
=======

Mark Galassi (rosalia@lanl.gov) - overall design, simulated annealing
Jim Davies (jimmyd@nis.lanl.gov) - statistics library
James Theiler (jt@lanl.gov) - random number generators
Brian Gough (bjg@network-theory.co.uk) -
  FFTs, numerical integration, random number generators and distributions,
  root finding, minimization and fitting, polynomial solvers, complex
  numbers, physical constants, permutations, vector and matrix functions,
  histograms, statistics, ieee-utils, revised CBLAS Level 2 & 3, matrix
  decompositions and eigensystems.
Reid Priedhorsky (rp@lanl.gov) - root finding
Gerard Jungman (jungman@lanl.gov) special functions, interpolation, 
  series acceleration, ODEs, BLAS, Linear Algebra, Eigensystems,
  Hankel Transforms.
Michael Booth (booth@debian.org (email address not working)) - Monte 
  Carlo integration
Fabrice Rossi (rossi@ufrmd.dauphine.fr) - Multidimensional minimization
Simone Piccardi (piccardi@fi.infn.it) - Ntuples
Carlo Perassi (carlo@linux.it) - Additional random number generators
Dan, Ho-Jin (hjdan@sys713.kaist.ac.kr) - divided differences interpolation
Szymon Jaroszewicz (sj@cs.umb.edu) - combinations
Nicolas Darnis (ndarnis@cvf.fr) - cyclic functions and the initial functions for
 canonical permutations.
Tuomo Keskitalo (tuomo.keskitalo@iki.fi) - multidimensional minimization and 
 ode-initval2 routines for ordinary differential equations
Ivo Alxneit (ivo.alxneit@psi.ch) - multidimensional minimization, wavelet 
  transforms
Jason H. Stover (jason@sakla.net) - cumulative distribution functions
Patrick Alken <patrick.alken@colorado.edu> - nonsymmetric and generalized eigensystems, B-splines
Rhys Ulerich (rhys.ulerich@gmail.com) - multisets
Pavel Holoborodko <pavel@holoborodko.com> - fixed order Gauss-Legendre quadrature
Pedro Gonnet <gonnet@maths.ox.ac.uk> - CQUAD integration routines.
