1. GNU Octave,
http://www.gnu.org/software/octave/
2. Matlab symbolic toolbox,
http://www.mathworks.it/products/symbolic/
3. Maxima, a computer algebra system,
http://maxima.sourceforge.net/
4. SBML: Systems Biology Markup Language,
http://sbml.org
5. Bortolussi, L., Le Boudec, J.Y., Latella, D., Massink, M.: Revisiting the limit behaviour of El Botellon. Tech. Rep. EPFL-REPORT-179935, École Polytechnique Fédérale de Lausanne - INFOSCIENCE (July 2012)