1. S. centralbyrån. [Online]. Available: http://www.scb.se/. [Accessed 26 9 2012].
2. E. Runkle and A. Both, “Greenhouse Energy Conservation Strategies,” Michigan State University-Extension Buletin, no. 3160, November 2011.
3. S. O. Statistik, “Eenrgy use in greenhouses,” SCB, 2010.
4. S. Sanford, “Reducing greenhouse energy consumption-an overview,” University of Wisconsin-Madison, 2011.
5. A. Ganguly and S. Ghosh, “A Review of Ventilation and Cooling Technologies in Agricultural Greenhouse Application,” Iranica Journal of Energy & Environment, vol. 2, no. 1, pp. 32-46, 2011.