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Bibliografia
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..  [Cyt] Cython, http://www.cython.org/

..  [Dive] Dive into Python, disponível gratuitamente na internet em
    http://diveintopython.net/

..  [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/

..  [PyDev] Python Developer's Guide,
    https://docs.python.org/devguide/

..  [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.
