1. Workshop on Green and Sustainable Software (GREENS). http://greens.cs.vu.nl. Workshop on Green and Sustainable Software (GREENS). http://greens.cs.vu.nl.
2. C. Pettey. Gartner estimates ict industry accounts for 2 percent of global co2 emissions. http://www.gartner.com/it/page.jsp?id=503867 2007. C. Pettey. Gartner estimates ict industry accounts for 2 percent of global co2 emissions. http://www.gartner.com/it/page.jsp?id=503867 2007.
3. P. Stoll. Blog on: Sustainable development of industrial software systems. http://piastoll.com. P. Stoll. Blog on: Sustainable development of industrial software systems. http://piastoll.com.
4. UNEP/GRID-Arendal Maps and Graphics Library. World greenhouse gas emissions by sector. http://maps.grida.no 2009. UNEP/GRID-Arendal Maps and Graphics Library. World greenhouse gas emissions by sector. http://maps.grida.no 2009.