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GNU General Public License v2.0 - GNU Project - Free Software Foundation (FSF). Free Software Foundation, Inc.. URL: http://www.gnu.org/licenses/gpl-2.0.html. Last access: 31 Jul 2009.
GNU Lesser General Public License v2.1 - GNU Project - Free Software Foundation (FSF). Free Software Foundation, Inc.. URL: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. Last access: 31 Jul 2009.
Gini coefficient - Wikipedia, the free encyclopedia. Wikimedia Foundation, Inc.. URL: http://en.wikipedia.org/wiki/Gini_coefficient. Last access: 31 Jul 2009.
Pareto principle - Wikipedia, the free encyclopedia. Wikimedia Foundation, Inc.. URL: http://en.wikipedia.org/wiki/Pareto_principle. Last access: 31 Jul 2009.
Lorenz curve - Wikipedia, the free encyclopedia. Wikimedia Foundation, Inc.. URL: http://en.wikipedia.org/wiki/Lorenz_curve. Last access: 31 Jul 2009.
SLOCCount. David A. Wheeler. URL: http://www.dwheeler.com/sloccount/. Last access: 31 Jul 2009.
COCOMO - Wikipedia, the free encyclopedia. Wikimedia Foundation, Inc.. URL: http://en.wikipedia.org/wiki/Cocomo. Last access: 31 Jul 2009.
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The R Project for Statistical Computing. Department of Statistics and Mathematics of the WU Wien. URL: http://www.r-project.org/. Last access: 31 Jul 2009.
S (programming language) - Wikipedia, the free encyclopedia. Wikimedia Foundation, Inc.. URL: http://en.wikipedia.org/wiki/S_(programming_language). Last access: 31 Jul 2009.
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