| [Cyt] | Cython, http://www.cython.org. |
| [Dive] | Dive into Python, Freely available online at http://diveintopython.org. |
| [GAP] | The GAP Group, GAP - Groups, Algorithms, and Programming, Version 4.4; 2005, http://www.gap-system.org |
| [GAPkg] | GAP Packages, http://www.gap-system.org/Packages/packages.html |
| [GP] | PARI/GP http://pari.math.u-bordeaux.fr/. |
| [Ip] | The IPython shell http://ipython.scipy.org. |
| [Jmol] | Jmol: an open-source Java viewer for chemical structures in 3D http://www.jmol.org/. |
| [Mag] | Magma http://magma.maths.usyd.edu.au/magma/. |
| [Max] | Maxima http://maxima.sf.net/ |
| [NagleEtAl2004] | Nagle, Saff, and Snider. Fundamentals of Differential Equations. 6th edition, Addison-Wesley, 2004. |
| [Py] | The Python language http://www.python.org/ Reference Manual http://docs.python.org/ref/ref.html. |
| [PyDev] | Guido, Some Guys, and a Mailing List: How Python is Developed, http://www.python.org/dev/dev_intro.html. |
| [Pyr] | Pyrex, http://www.cosc.canterbury.ac.nz/~greg/python/Pyrex/. |
| [PyT] | The Python Tutorial http://www.python.org/. |
| [SA] | Sage web site http://www.sagemath.org/. |
| [Si] | G.-M. Greuel, G. Pfister, and H. Schönemann. Singular 3.0. A Computer Algebra System for Polynomial Computations. Center for Computer Algebra, University of Kaiserslautern (2005). http://www.singular.uni-kl.de. |
| [SJ] | William Stein, David Joyner, Sage: System for Algebra and Geometry Experimentation, Comm. Computer Algebra {39}(2005)61-64. |
